Potential Threads of Fate dungeon loot bug?

I recently leveled both my monk and hunter to 60 via dungeon spamming with Threads of Fate and observed a strange pattern on the loot I would get from the dungeons; For each dungeon while leveling, I would receive the exact same items every run, with progressively higher ilvl as I was gaining levels. I can't say I was paying a ton of attention while I was actively leveling, but when it came time to vendor the items I'd replaced, I vendored 4-6 of the exact same items in multiple slots. This happening once or twice seems unlikely but not outside the realm of possibility, while the odds of the same thing happening as often as it's happened to me seems extremely improbable.

Napkin math puts the odds of getting repeat items from the same bosses just once at 2.56% for my loot spec on my hunter, so having it happen multiple times in a row sounds like a bug.

Has anyone else experienced something like this?