Animation Twiching

So I’m having trouble getting certain animations to play correctly in unity. I’m using Carrara 8 to rig and animate the models, then I save as a dae file and convert to an fbx. The thing is that some of the animations work fine… but others “twitch.” In reality the model rotates some random direction for a split second, which makes it look like its twitching. I feel like I’ve gone over everything about 20 times and have tried everything I can think of… Any help or suggestions would greatly be appreciated.

Is the whole model rotating or just particular bones?

The whole model is.

Can you post one of your animations which has this problem?