There is a limit on JokerChange.
Maximum of 88.66 USDT (TRX) = Maximum of 88.66 BTC.
This means the exchange does not accept the above amount.
This is what I am suggesting
Maybe you should indicate the minimum and maximum limits right below the "you send" box instead of displaying them in the "You receive" box to avoid confusing a trader, especially someone new to your platform?
Let the "You receive" box display only the amount of coins the trader is going to receive
Don't worry, on the exchange page, the user will not be able to exchange if the amount exceeds this amount.
When the user clicks on the "Start exchange" button, nothing will happen.