Messages stickers is floating in the background.
I was sticking stickers to a message and then it just sticked on my wallpaper! Restart won't help! How can I fix this problem?!!
MacBook Pro (2020 and later)
Try going to System Preferences/Desktop & Screen Saver/Desktop and reset your desktop background to see if that helps.
If you control - click on them, do you get a delete option?