Don't know if it's intended or it's a bug, but the drop rate for Dire Wolf Skulls, counting as lvl 81-85 trophies, seems really low. I'd estimate it somewhere between 1:7 to 1:9
Can you please check it?

Also maybe it is worth to note that for this range, there are only 5 type of trophies accepted (Blood Skulk Pendants, Golem Hearts of Marble, Shrunken Purple Weaver Thoraxes, Feral Bloodsnout Youngling Tusks and Dire Wolf Skulls) and the drop rate for all of them seems either too low and/or the mobs are available in very low numbers making trophy gathering for this particular level range (81-85) extremely, and i really mean extremely hard.