Reply to Record button messes up song key

I got a question here, i hope its not been asked before, but i didnt find anything on this elsewhere on the community :
Sometimes when i hit the record button on my MF (Deckalized Mapping 1.1 on Traktor Pro), it will change the pitch of the tune, making it sound lower and slower. (alltough its the same speed).... allthough i got keysync on.
any idea how i can avoid that?
cheers
sam



Specs: Mbp 2009, Traktor Pro 1.2.4. Midifighter.