I have seen this multiple times. The hero goes to fight at a clandestine location, bets are placed, money changes hands, but no ticket is given to the gamblers like they usually do at horse tracks.
So how do they pay the bets after the fight is over?
My guess would be that it is just a director's trick to enhance the chaotic nature of the moment, but to me it just doesn't make sense so I wonder if I'm missing something.
The last time I saw this was in the Netflix Iron Fist, when his girlfriend entered the cage.