I’ve had this problem on some systems as well but in PAL. I get frame 1 ok, frame 2 is frame 3 and frame 3 is frame 1 again and then comes frame 4 (sorta). One frame is missing and you get a “jiggy jump” to it.
One solution has been to “clear all caches” before rendering. It also seems the type of imput-file can be an issue. I had the issue with a number of QuickTime/Animation files. Converting them to 10-bit Uncompressed made the problem go away.
I don’t know if this is a QT or AE problem, but the abnormallity of “framejumping” only reflects in AE. I’ve seen it happen through Nucleo also in AE (actually more frequence than though AE it self).