I have also had this bug on Android for quite some time, but never got around to reporting it. Just learned to avoid it. Happened recently though after cropping 3 or 4 images on Android iNat v 1.28.6 (259).
In a related issue, if you are going through multiple uploaded images and delete one of them, it throws you back out to the observation details screen, rather than skipping to the next/prev image. I sometimes load several images into the app that need to be cropped before I can decide which ones to keep.
Cropping sometimes does strange things to the pictures involved. I have the same and similar issues as stated above, all related to cropping on the Android app.
For me, usually one or all crops revert back to the original dimensions.
I too forgot to report this as a bug. I will do it when I experience it again.