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