pfSense

Since a few day parameters missing when I try to edit an existing gateway group on my pfSense 2.2

If a try to create a new group, only two gateways are available instead of three

My settings

If I make a backup, parameters are correctly exported

<gateways>
    <gateway_item>
        <interface>opt1</interface>
        <gateway>X.X.X.X</gateway>
        <name>SFR_GW</name>
        <weight>1</weight>
        <ipprotocol>inet</ipprotocol>
        <interval/>
        <descr/>
        <monitor_disable/>
    </gateway_item>
    <gateway_item>
        <interface>opt3</interface>
        <gateway>X.X.X.X</gateway>
        <name>LIVEBOX</name>
        <weight>1</weight>
        <ipprotocol>inet</ipprotocol>
        <interval/>
        <avg_delay_samples/>
        <avg_loss_samples/>
        <avg_loss_delay_samples/>
        <descr/>
    </gateway_item>
    <gateway_item>
        <interface>wan</interface>
        <gateway>X.X.X.X</gateway>
        <name>ETERA_GW</name>
        <weight>1</weight>
        <ipprotocol>inet</ipprotocol>
        <interval/>
        <avg_delay_samples/>
        <avg_loss_samples/>
        <avg_loss_delay_samples/>
        <descr/>
        <defaultgw/>
    </gateway_item>
    <gateway_group>
        <name>WAN_INTERNET</name>
        <item>LIVEBOX|1|address</item>
        <item>ETERA_GW|1|address</item>
        <trigger>down</trigger>
        <descr/>
    </gateway_group>
    <gateway_group>
        <name>WAN_MAIL</name>
        <item>LIVEBOX|2|address</item>
        <item>ETERA_GW|1|address</item>
        <trigger>down</trigger>
        <descr/>
    </gateway_group>
</gateways>

pfsense 2.2 installed and configured from scratch