On Android, and I just started on Arena for the first time even though I've been playing paper for years. I've been trying to play through the tutorial and eventually the creatures that get played just stay in the stack area. The game acts like they are on the field, but their icons are still in the stack area. This is very frustrating, as you can't see these creatures and the stack area gets EXTREMELY messy. Please fix as soon as possible. Didn't take screenshots, but when it happens again I'll add them.