This will happen if you have already withdrawn your balance. If you recently executed a sell trade, there is a settlement period before you can withdraw funds.

The US market follows a T+1 settlement arrangement where settlement will be completed on the next business day after the trade is completed.

The Singapore and Hong Kong markets follow a T+2 settlement arrangement where settlement will be completed on the second business day after the trade is completed.

Once the settlement period is complete, your withdrawable balance will show the full amount that you can withdraw.