The app I used was ingotsex.vip . The commission are 0.00300000 for all cryptocurrency. I had about 18k usd before the trade and after the trade was done I was left with 6k usd . Thankfully I already made profit before this occurred. I just wonder if there is anything reason for this or its just a scam. I was told it had something to do with volume but I wasn't sure.
https://ibb.co/4Wx98Fc I don't really know about this exchange, maybe the trading fee there is bigger, but if it's like that you better leave the exchange like that, and switch to the more famous and big Exchange.