Ok, this question might sound stupid, but... are we sure it is a glitch and not something like a deposit bonus promo and the likes? I tried to toy with the amount, counting in a rounding error, the number is indeed around 20%, it's a tad bit too precise for a random glitch and, IMO, more like a bonus.
I am positive. There is no cash bonus except for free spins. They have a cash bonus but that's a 50% deposit bonus which was a 30x wagering requirement. I am kinda regular there so I am aware of their promos.
Another incident happened and I am frustrated now.
I had USD 85.16 withdrawal request since 19th August (The day I deposited again to check if they have fixed it). Today they released the withdrawal with Mark as paid but I received 0.3141 BNB which is USD 68.32. So my 16.84 USD is missing from there. They have the worst support that always collects data and never comes back to the clients. If this continues to happen, fuck me!