If you took the trade by choosing the amount based on a range, what you see might be a bug and could be considering the minimum value of the range, although when the trade is executed, you will receive what you are entitled to.

What do you think  @KoalaSat?
 

 I'm buying the minimum, 500. 

 https://m.primal.net/Knta.png https://m.primal.net/Knte.png 

It's a bug. Tha happened before but you will receive the correct amount.  

You can try robosats app and you will see everything is right.