I’ve encountered a bug when clicking “edit” on an Animation COMP when an existing one is open. Instead of switching which COMP is being edited, it attempts to open two editors, and the UI breaks significantly. It can be resolved by closing all Animation COMP editors before clicking edit on a new one. I’ve included a screen grab of the issue below.
To recreate it create two Animation COMPs, click edit on one, and then edit on the other. It’s happened across a couple recent versions of the Alpha for me now on multiple machines.