The great TOK slide

I need a wider group of opinions, but at least at my school, most (about 12 per 14) people had a major decrease in TOK final from the expected/in class grades. Most of us had expected B's or C's to end up with C's and D's. Even one who excelled and expected to go to Oxbrige now cant due to falling A to C. Is this just a local phenomenon where the teacher (who flexed an 80+ prediction accuracy before) fumbled, or is this a wider phenomenon?