Negative Amount on Trade is computed even when clicking 25% to 100%

Hello again. I tried to make an order on tomo dapp dexchange. I have enough tomo coins on my testnet account about 559.9 tomo. I go through the buy button and clicked it. It redirected me to the buy and sell page, Since i want to execute a buy order, i clicked an amount on the running orders then i choose desired percentages either 25% , 50% 75% or 100% but it shows negative value on the amount to be executed. I even tried to clock on other amount on running orders, yet same result happened.

Here is my tomo address:
0xafb82d9c2609ead9534774b16f9d1377d2decea3

You can see it through these picture and video.


https://youtu.be/inGU-KdK_4A