This is how it should look...
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 15 permit any

...although my personal prference is to start at 10 with +5 increments for textual alignment....so....
ip prefix-list ACCEPTFILTER seq 10 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 20 permit any

 

But what actually happens when running the command in about half-second increments....

############## actual CLI output begins next line ##############
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
firewall1.home.arpa# show running-config no-header | include prefix-list
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
 match ip address prefix-list CONNECT
 match ip address prefix-list ACCEPTFILTER
 
 
 
############## full config ##############
 firewall1.home.arpa# show running-config 
Building configuration...

Current configuration:
!
frr version 7.5
frr defaults traditional
hostname firewall1.home.arpa
service integrated-vtysh-config
!
password LAB
!
ip router-id 192.168.1.1
!
interface em1
 description "ospfd: LAN_passive"
 ip ospf area 0.0.0.0
 ip ospf cost 4
 ip ospf priority 0
!
interface ovpns2
 description "ospfd: LAN_passive - ospfd: TUNNEL1_active"
 ip ospf area 0.0.0.0
 ip ospf authentication message-digest
 ip ospf cost 8000
 ip ospf message-digest-key 1 md5 BAAAAAAAAAAAAAAD
!
interface ovpns3
 description "ospfd: LAN_passive - ospfd: TUNNEL1_active - ospfd: TUNNEL2_active"
 ip ospf area 0.0.0.0
 ip ospf authentication message-digest
 ip ospf cost 9000
 ip ospf message-digest-key 1 md5 BAAAAAAAAAAAAAAD
!
router ospf
 ospf router-id 192.168.1.1
 auto-cost reference-bandwidth 400000
 redistribute connected metric 20 route-map CONNECT
 passive-interface em1
 area 0.0.0.0 authentication message-digest
!
ip prefix-list CONNECT seq 10 permit 10.1.194.0/24
ip prefix-list ACCEPTFILTER seq 20 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 25 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 30 deny 10.255.1.1/32
ip prefix-list ACCEPTFILTER seq 5 deny 10.255.1.0/30
ip prefix-list ACCEPTFILTER seq 10 permit any
ip prefix-list ACCEPTFILTER seq 15 deny 10.255.1.0/30
!
route-map CONNECT permit 10
 match ip address prefix-list CONNECT
!
route-map ACCEPTFILTER permit 10
 match ip address prefix-list ACCEPTFILTER
!
ip protocol ospf route-map ACCEPTFILTER
!
ipv6 protocol ospf6 route-map ACCEPTFILTER
!
ip protocol bgp route-map ACCEPTFILTER
!
ipv6 protocol bgp route-map ACCEPTFILTER
!
line vty
!
end