Interface suddenly went bonk

My chat interface is suddenly broken in the past few days. There are empy ovals that appear to be “shadows” of the existing buttons. See screenshots. The box in the top left actually blocks the text entry box so that I can’t start typing!

This is in Chrome. I’ve tried clearing cache, changing browser text size, etc. It works fine in Firefox! Maybe it’s something stupid I did. If anyone has any insight I’d appreciate it.