Something's wrong?

Ok, so I needed a bit of cash so I decided a few minotaur/ troll farming.
On a usually run I would often get 7-10 drops from pulling bout 11 minotaurs and when i finished them off, i only get 2 drops...So then i zoned back and repeated the run like always and again i got 2-3 drops. Each time I did a troll or minotaur run i would only get the same amounts. Is any1 experiencing the mis-drops?

you have triggered the anti-farming code, find another area to farm.