Why are my masks out of sync in final export?

I have been attempting to export out a final version of a project and have found that some of my masks are not lining up.

When I Re-check the composition the masks are fine and line up.

Here is an example:

EXPORT

https://www.dropbox.com/s/f9qavqspjp4b1a1/RENDER_MEv10_00644.png

COMP

https://www.dropbox.com/s/il3ktf4rpzj5iee/Screen%20Shot%202013-06-30%2 0at%205.08.02%20PM.png

I have done the following to try figure this out (nothing hs worked)

- Preserved frame rates in comp settings

- checked everything is the same frame rate (25fps)

- baked the mask (key everyframe)

Does anyone know how to solve this ?

Cheers Pie