Bellagio Ruling

[Huskiez]

I have a question about a ruling that was done a few weeks ago at the Bellagio.

I am playing NL. CO limps, SB calls, I raise pot, CO calls, SB folds.

Flop comes Kxx.

I am thinking about how much to bet, so I look down at my chips and think. After five seconds, I noticed that there's a turn card out there. What just happened?

Apparently the dealer thought that when I looked down I had checked. I may have brought my arm down but I definitely did not rap the table to check. She had motioned to CO what he wanted to do, and he checked. She turned the next card.

My friend in SB knew I had not checked and no one at the table had seen me check either.

They called the floor and said that the turn card stands and to play it from there as if I had checked.

I thought it would make more sense to shuffle the 3 back in the deck and let us play the flop. But I didn't get a chance to object because floor said her ruling was final after one second of deliberation.

Is this a standard ruling?