You ran into the very bad resistance bug, which is very well known to us.
You have two options now.
1) download the latest
patch !
The problem is that you would have to start a new game, as savegames before can´t be used anymore. On the other hand is the release version full of bugs, which almost all are cancelled out with this patch.
2) edit your stats (resistances) with
iZakaron´s save editor .
Good luck! <img src="/ubbthreads/images/graemlins/wave.gif" alt="" />
Edit: @ Alrik: you really don´t know more about this problem? <img src="/ubbthreads/images/graemlins/eek.gif" alt="" />, there must be 20 threads about this in the forum... <img src="/ubbthreads/images/graemlins/rolleyes.gif" alt="" /> <img src="/ubbthreads/images/graemlins/ouch.gif" alt="" />