Waaaay too dark

Every time I order shirts from Sticker Mule they’re insanely too dark, it’s as if they’re not even looking at the art, like they have no quality control. I make my designs myself and know how bright they are. There’s no excuse. There’s also parts of the design that are randomly shiny, whereas the rest of the design is matte, I hate the cheap looking shiny spots. I dread how my shirt designs are going to look every time I order. I’ve had to get reprints more times than I can count