Markups become permanent and I can’t erase

After taking a photo in notes, I would markup the photo. However after clicking done, when I go back into the photo my markups seem to have been permanently marked into the photo. I can’t erase them, but I can still add to them. Any time I click done my changes become permanent and when I try to open up the photo again I can’t erase anything. I’m not sure what is wrong because my friend’s IPad can do this perfectly fine (markup a photo in notes, click done, go back in, and erase previous markups). This problem just started today. Previously I was able to do this without problems. I have tried restarting my IPad, it doesn’t help.