Model's Attack Animations are screwy

[Wintermute]

I have this model, I'm not sure where I downloaded it from. It looks very much like a Grey Knight from DoW.
I've imported it to my map and now, everytime it attacks, it plays two attack animations, rather then one. If anyone could find out the source of the problem, please do tell me/help me fix it. Thanks. Oh yes, +rep if you do. The model's attached to this post.