[Autumn]

You can currently cheat out your skill slots a bit with spellbook by having a tome equipped and switching to your actual weapon in battle, normally I wouldn't have a problem with this but it seems as though you keep these skill slots even after the battle is over (Eg. Having 25/20 skills equipped.), adding a check for your skill slots at the end of a battle would probably fix this issue.

[Neus]

This has been corrected.