-snip-
Oh this 10,000$ came from Botairtx.
That's why really weird, in the screenshot only 999$ but he withdraw 10,000$ in the screenshot, by the way who is this "Botairtx"? Influencer streamer who have partnership with Duelbits?
Never hear of him

Im not sure wether he is affiliated with Duelbits or not ( I think he probably is ) but here is the tldr version in case if you are still confuse
@Botairtx won the challenge of being the first player to hit 10,000x multiplier on plinko thus he gets $10,000 from Duelbits. At the same time, @MelloGambles claimed that he was the one that hit it first but Duelbits removed his bet.
After discussing through discord between those two, @Botairtx decided to send the $10,000 to @MelloGambles as it seems
that he is the rightful winner ( there isnt any additional information on how he decided to get to this conclusion ) thus also asking Duelbits to clarify what exactly happened
I noticed that MelloGambles mentioned Botairtx on Twitter even before this Plinko challenge was announced by duelbits. Thus, it can be assumed that these two knew each other, and it explains why Botairtx decided to send the prize to MelloGambles. At least I doubt someone else would have sent such a big prize to an unknown user even if this prize had been credited by mistake. In any case, it's a very strange situation, and I hope the Duelbits team will make a statement about it.