The Hero/Lord level editor always affects my heroes and lords when they hit max level, even when it's supposedly not turned on, jumping them straight to lv51 when they hit lv40. Even when being forced to use the editor to fix their level, and using the "freeze value" toggle so that this stops happening, it still happens, with lords jumping to lv51 after hitting end turn.
This is a problem, because the level cap is 40 and going over that breaks your saves. (It breaks my saves, anyway. I don't know if it's a problem for other people.)
This. The level/skill editor is messed up in this version of the trainer. Every time a Lord that has been tampered with gains xp, the levels get buggy beyond the cap.