my understanding of the crag trials is that they have 2 separate pools

pool 1 is the drops that drop specifically from that trial
pool 2 is the drops that drop from any crag trial (and the collection menu makes it extremely unclear which is which, because i was always confused why it was dropping an item listed from SO when i ran AA lol)

when a loot drop is rolled, it randomly selects pool 1 or pool 2, and then curates from there

if you say already had all of the items in pool 1, and it picks pool 1, thats what it would curate from without even looking at pool 2

honestly i think it just confuses everyone and makes getting the right drops more difficult and they should combine pool 1 and pool 2 into a single drop pool, or actually go off of what is in the collection menu

as an example ive completed the vicious serpent set even though i barely run SO (where the set is listed in the collection menu), but this is one of the sets that can drop from any crag trial, so i got a majority of the drops from this set from AA or HRC

they need to go through and change the drops so that the trial drops match what is in the collection menu