@Phyxkes You mean the Thought Projector universal hat? Try checking it for a few characters, first of all. If you checked one character, it may not appear for them, but rather for another character. If that does not work, try restarting your game.
If that does not work, you could try and get assistance at EA Help here, and let them know about your issue:
https://help.ea.com/en/plants-vs-zombies/plants-vs-zombies-battle-for-neighborville/.