hey guys

I'm having a strange problem with Maya2012:

I have two 600 animations. They have identical animation and render settings. (24fps, 1024x768)
>24fps set via the Animation Preferences
>resolution set via render settings, also set to render only from frame 1 to 600 on both

and yet... one comes out at 500Mb, lasting 20 seconds

the other one lasts 33 seconds, but essentially stops at the 20 second mark, with the last 13 seconds being the same frame.

basically: both are weird. File info marks their FPS at 29.

I have no clue what's wrong.

Also I'm a bit of a maya nublet (its been 3 years since I last worked with it) but I know enough to tell that this ain't right

Suggestions?