This even is anything but normal for me, as I've had extended periods where the 90/12 map drops exclusively 3 or 4 bone fragment items, averaging at 16 fragment value which is ridiculous. On top of that I just had a run where the drops were 2 fragments, a 3 and 5 value for 8 total.
Something seriously needs to be fixed if the devs expect people to keep playing their game.