Close, But Color Not Quite Right

We ordered these magnets for our embroidery company. The quality of the magnet is great. I love the quality we get from Sticker Mule. The size was spot on and they arrived very quickly. The only thing is the grey color. I created this in Illustrator, and sent the Illustrator file for review. The mockup came back exactly like the file I sent. The final print came back a bit different. The background color is much lighter than the mockup. The other colors were spot on though. Still excellent quality, just not quite on the nose in execution.