Questions about compositing in vr with maya.

I was animating my 3d model(triceratops, picture in profile) and rendered out a short walk cycle in Maya using a spherical lense on a camera.

I played this on my headset and it looks good. Then..

I overlayed the maya rendered footage on top of a 360 image inside after effects than rendered those together with a few color corrections.

Now, when I played the sequence back on my vr headset, the overlayed image looks like it's wrong. It looks spherical. While the 360 image looks fine.

My rendered footage no longer looks right and I'm not sure why. Any suggestions?