On iPad, there exists a gesture to swipe left or right with 4 fingers to switch between apps. I use this to switch back and forth between a dictionary app.
This works fine swiping away from Anki, but swiping back in results in the currently active card to automatically zoom in by a good amount, consistently the same amount and location (off-center) each time.
Repros 100% of the time on my new 11” iPad Pro running the latest OS.