Duriel drop, chance to drop, is it normal?

Hello everyone.
I did more that 2000 on Duriel, and now i got.
10 Anraiel Helmet , 5 Rings , 4 Amulet , 2 Shako and 4 Doombringer and still 0 GF…
Some dudes in party get GF afrer 50-100 runs…
Is it normal or i got problem on charracter ???
Maybe server forgot that i playing Barbar and think i was Sorc ? :smiley: