It's a bug they're working on fixing, for more info see: http://forums.play.net/forums/GemStone%20IV/Combat,%20Magic,%20and%20Character%20Mechanics/Character%20Creation,%20Stats,%20and%20Skills/view/628

Which states:
There's currently a bug with inter-level TPs not being allocated correctly after log in. The closer you are to achieving your next level, the more TP deficit you'll notice. We've been working to resolve this issue over the last day. We'll post when it's been resolved. Sorry for the inconvenience.

GameMaster Oscuro