I have a file with a single character. I ported everything to 2.8x using Evee.
In the viewport - the animation looks fine.
When I render the same frames - everything falls apart.
So far - I’ve rebuilt the file, redone the animation frames, tried 2.82, 2.80, and 2.81a, I’ve reset most of the settings I can find that might control the animation (I’ve probably missed something) and I still have the same problem. It makes no sense to me - it looks like the camera isn’t recording at the same rate as the animation.