(On Right: what it looks like in blender after re-importing again all zig-zaggy (but looks fine before first export), On Left: Nifskope view)
http://img220.imageshack.us/img220/8329/badar.jpg
What I did was import the horse skeleton with idle animation, and the human skeleton with walkleft animation. then i made the animation on the horse part using the human bones are a guide for the horse ones, when i exported it, it went all weird...it is fine in blender.
ANyone know why this is happening, it doesnt seem to happen if i just make a normal animation with the horse part skeleton, or human animation, but i do get the screwy results on my centaur skeleton too...
I am totally confused on how to fix this, if anyone thinks they could have a go at fixing this, i can send blender files and nifs through a PM.