Skinport restricting how much I can sell for.

Hello, I was trying to buy skins on skinport, and decided to sell some cases I had (Fever cases) and it's not letting me go above $1.34, 120% higher than their suggested $1.12, when cases are clearly going for $1.58. Link to website so people know I am using the legit website. Support was a wall and couldn't give me a clear answer. Anyone know how I can sell for $1.58?

https://skinport.com/market/container?item=Fever+Case