I'm basically having problems with the custom animations I created with milkshape and sims 3. They're working but they aren't exactly working right.

I followed this tutorial on youtube on how to make custom animations with the sims 3 (its a tutorial involving milkshape):
https://www.youtube.com/watch?v=k5G80OTK6lM
https://www.youtube.com/watch?v=phWxC_qOFWM

I followed all the steps and the revised steps from the second tutorial vid, and the animations were able to play in the sims 3 but they didnt play correctly. For example, this animation:

This is how it played in milkshape and how i wanted it to play in the sims 3 (notice how high the right arm swings up):
https://www.youtube.com/watch?v=4SO37ttf46g

but when i imported it in the sims 3 and tried playing it, this is how it turned out:
https://www.youtube.com/watch?v=m8UG0v4KjDM

The probelm is that the arm isn't swinging up high enough like it did in milkshape. Is there anyway to fix it so it plays exactly like it did in milkshape? What is causing this problem?

Please help?

can someone help me fix this?

I don't know, but I'll try. Do you have animation smoothing on or off in your options?
Taking a wild guess, I think you may have an IK chain in your animation that doesn't
belong there.