The draggable cursor has been getting stuck on the span mode, and refuses to go back to the single cursor no matter where you tap. Sometimes the end even gets stuck at the end of the whole comment text, and can't be moved to span a single character, unless it's the last one. Sometimes it works fine, but usually not. It does usually seem to go back to normal if you cancel, and re-edit.
Damn, I thought this was just me. Happy (I guess?) to see otherwise. FYI, if you're on Android, you can drag left and right on the spacebar to change the location of the cursor. That's how I've been getting around it.