Event Server Cosmetic Unclaimable when you don't click the claim button

In the Universal Event server, I've found all clappers, but I didn't click the claim button after I found them, so I can no longer claim my prize.

Steps to reproduce:

1. Find all clappers in the Universal Event Server
2. Don't click on the claim button, click outside of it

Result: The prize I was supposed to get became unclaimable.