I think you will find Hmm is correct.
If you look in Windows Task Scheduler (not through CCleaner), it shows that CCleaner has hidden itself there and yet is not visible when you show the task scheduler within CCleaner. So they are effectively hiding it from you. Not great for a tool that is meant to give you confidence it "cleaning". The Schedule Task has the switch /monitor, so its running in the background, even if Monitoring is turn off.
End Task CCleaner, then Open Windows Task Scheduler and delete it manually from there. Then restart windows.