For the last few days i have been running primegrid on my gpus and wcg on my cpu. I had disabled getting work from the cpu and therefore had not been receiving any cpu work. just as i wanted.
yesterday though some ESP sieves downloaded after i uploaded some completed work. this seemed odd, as it had not been doing this. when i logged into my account, the checkmark for using the cpu had mysteriously become ticked.
i wondered if my account had been hacked, but it would seem a strange thing to do if it had been!