Crazy Pineapple ruling question at Commerce

[sternroolz]

This happened quite a few years ago, but has been grinding on me even to today. Game was Crazy Pineapple Hi/Lo 8 or better. $3-6 limits.

Basically called around preflop. I held 44x. Flop came 44x. I led out and was called in 3 places. Discards and then turn was a brick and I led again. All fold. As I fold my cards, another player says.."Hey, he has 3 cards". My hand had already hit the muck. Floorman is called over and it is decided I had three cards(I did, I forgot to discard.) Floorman rules that the pot must be split back amoung all players involved in the pot.

Is this the correct ruling? I remember being pretty pissed at the time as everyone had folded to my turn bet.