WP Ultimate Search is returning the word "Busted!"

When I type in a search word in the search field and hit enter, it’s saying “Busted!” and I have no idea why. It was working fine just the other day. Any ideas what’s causing this?

I switched back to the standard WP search field until I can figure out what’s wrong.

https://www.ads-software.com/extend/plugins/wp-ultimate-search/