Either his pyschic powers failed (again) or he had coffee instead of tea that morning

well obviously he is not psychic, though he takes being a bad psychic to a whole new level, it's like the law of probability was laughing in his face

He claimed he did.

I suspect little psychic ability was required to come to that conclusion considering how much feedback HMs have received.

the Darkside clouded his vision .

Wait, are you saying that Mark's psychic abilities have no power to actually predict the future?

But he did predict it. Right after Emma told him he'd been evicted, he said, "I knew it".