Ouch. That's a weird glitch that passed thru the testing hole.
A Berry Quick Patch
Whoof, can't believe this bug slipped through the cracks of the latest update, thankfully it wasn't really a game breaking bug.
Fixed: A bug where if you let go of the cash register during Berry's Charity Night and press E again, it'll convert the cash register to a regular cash register, thus defeating the purpose of the random event's special Berry the Bear cash register.