Anyone else have a page curl that displays like this?

Our page curl ad isn't displaying correctly. It jumps around and shifts behind the curl. I'm used to the curl revealing an image that doesn't bounce around. Check out the video and let me know if any of y'all have similar issues.

I found a video that demonstrates how I think it should work. Notice how the ad graphic doesn't shift. It just fades from the small ad to the large ad.