What would cause tripcodes to be shat out differently every time?

The Wakaba install was working perfectly before it was moved to a new system (that was set up almost exactly the same), and now using tripcodes results in a random output. They're completely broken.

We're one of the "large" chans, probably the only one of large size still using Wakaba as Kusaba is a hunk of shit, so this is a bit of a critical problem.