Question on a ruling in my WSOP (#8) event

[WarDekar]

Okay, so yesterday is Day 1 of the #8 event (Omaha 8 or Better) and early on in the tournament I have something like A23x with a suited ace. Flop is something like 944 giving me a (nearly) uncounterfeitable low draw and a nut flush draw, flush hits on turn and low hits on river.

We go to showdown, I declare "nut low, nut flush." Player to my right throws his cards on the table, face up, and declares "trip 4s." Now, he has a 9 in his hand as well for the flopped boat, but he clearly didn't have it as he wasn't betting aggressively and didn't take any of the pot. He pushes his cards to the dealer who procedes to push me the pot and begins shuffle the cards (on the table, not riffling yet).

Now, AFTER I have all the chips stacked up and by me, player 2 seats to my right says "You didn't have trips, you had a full house." I knew he had the full house, but did not say anything as it is not my responsibility, and the dealer missed it. Villian says "No I didn't, I had 49TJ and there was only a 4 on the board" while 2 to my right says "No, there was a 9 on the flop."

Now, this is after I have all the chips in front of me in neat stacks, so this has been a little while after the hand was showndown. Villian obviously wants his chips, but I say "Well I've already raked the pot, it's too late to change now." Dealer calls the floor, who asks the table to confirm or deny the hand and 2 to the right along with 1 other player say yes, there was a 9 on the flop. Naturally I know this is the case so I re-create the betting and give him his chips as per the Floor's request.

My question is: What's the official ruling on this? As I understand it it's the dealer's responsibility to call hands at showdown, and once chips are raked and cards are starting to shuffle it is too late to change anything. Clearly both the player and dealer (and maybe me?) were at fault on this. It was only 200 chips in Level 1, but I was still a little confused as to the Floor's decision.

So what's the deal? This year seems to have had quite a few floor/dealer problems...