Blood sacrifice can also trigger the alert apparently as under some unknown circumstances a priest trying to blood sacrifice while not having blood slaves can get free slaves.
Hmm, that's really odd. No idea why it would say I'm cheating. My income was the same as usual and I don't have the alchemist's stone. I didn't alchemize an unusual amount of gems Last turn. Maybe it is some kind of blood sacrifice bug. Should we save the turn and send it to the devs?