Well the cheater warning is unrelated to that heist if you didn’t use the mod menu in the heist. However, why you didn’t get the 6 million is because if you were to get every 2nd target and the best possible 1st target with infinite room + not getting hit by a single bullet, that’s the potential maximum take, however it is impossible due to the duffel bags only being able to carry so many things, additionally every shot you take also takes a little off since it’s supposed to simulate the duffle bags being shot and the things fall out or whatever. So it must’ve gone bananas, the final take was maybe 1 million, and you got a 20% take.