I have the same issue. Footage shot on P2. Using dynamic link from Premiere to AE to key and grade. I talked with Adobe’s support team and they said it might be because of using Apple’s FCP log and transfer to import the footage from the camera. I used Prelude. Glitch is still there. Any time I make an adjustment to any effect in AE, the glitch disappears from its current frame, but shows up somewhere else in the timeline.

Any luck?