Hi there. First up, I like this app a lot and I appreciate the effort you put into it. I have v2.27.7 on an iPhone 7 running the latest iOS.
I usually do concurrent exercises, alternating sets. I believe this is called supersets. As such, I usually move in and out of exercises before all sets are complete. If the cursor is left in a rep or weight field, when I go back into that exercise, the data in that field with the cursor is erased. It’s a bit annoying to have input the data again, and sometimes I get confused about what stage I’m at in the exercises. I hope my explanation is clear enough.