I am in position 4 and am delt pocket kings. On the flop is rags.I bet 25 dollars. No 9 calls all in for 43 dollars. No 3 calls for 43 . I call for the other 18 dollars. No 3 and I agree to check it down prior to the turn. I turn my cards over. No 9 yells that I mucked my cards. the dealer says the same and the casino group leader takes his position and picks my cards up and throws them away. since we both agree to check down nothing would have changed. I can’t see where I violated any thing. I would like to hear tj’s comment.thanks