Intermax's high gap between exchange rates of money deposited and withdrawn

Originally, someone recommended me this platform, so I decided to give a try and deposited in it. When I withdrew money, I found that the exchange rates between the money being deposied and the money being withdrawing were in huge gap. I deposited 1,000 dollars, and when I withdrew the money, 140 yuan were deducted, an equivalent of 2% of the deposit....is it normal? I deposited and withdrew the money the next day, the value of RMB depreciated so fast? .... Anyway, when you choose the platform, be aware of that.