pfSense

services_dhcp.php has not changed since 1 Jan 2015 so should be the same in 2.2
I do not see this problem in 2.2
What browser are you using?

Apparently I was not specific enough. This is in the "DHCP Static Mappings for this interface." -- i.e., when you add a static lease. FF36, Chrome v42, IE11. All messed up. (Latest 2.2.1 snapshots.)

That made me update my home system to 2.2.1-DEVELOPMENT - time to be checking/testing with that anyway. From Firefox 31.5.0ESR I can add or edit static mappings, click the Dynamic DNS Advanced button and the fields all open out nicely like they should.
Tried on another laptop with Firefox 36.0 and I cannot reproduce the issue there either.

Exact same messed up layout on multiple 2.2 nanobsd boxes. Dunno guys, but I can see obviously missing BR tags on lines 507 and 511 of services_dhcp_edit.php when you compare that with lines 1052/1056 of services_dhcp.php.

https://github.com/pfsense/pfsense/commit/5cfd948144741ba0d6981f89b2e40257cb9ef2b1 <= this is missing with services_dhcp_edit.php

Now I tries with psense_ng_fs theme and can see the problem. That is the different factor. The full screen width is making things like this seen, the text and fields that are missing "br" can actually be rendered on the same line.
Yes, it needs fixing. And you might like to open up lots of GUI pages with pfsense_ng_fs theme and see if there are other places where similar happens.

I made a pull request to fix that: https://github.com/pfsense/pfsense/pull/1535

Applied in changeset bd5a82681d7c9206799a4b72ffa943ec648ef47f.

Fixed, thanks. ;)