No way this happened in a "Live" game.
From the "Comments" section on the above link:
"It looks like a ball reader error to me. (remember I'm a test guy!) ...
19 and 20 are situated 180 degrees apart on an "American" style wheel (BIG CLUE). If the wheel is started, stopped, then re-spun (leaving the ball in place) you can easily get the same reading over and over on the ball reader. Maybe someone was just using it for training or it was being clean, reset, re-leveled.
But, most likely, the ball reader is just plain flakey. Happens all the time at Roulette tables (and bacarract too)... that's why there's a disclaimer saying the the number board is there as a convenience to players and it is not guaranteed to be the actual win number."