First time I've been dissapointed by Sticker Mule

I'm a tattoo artist and use Sticker Mule fairly frequenly to print stickers. I wait for one of the weekly deals that I like and order whatever flash design I have ready, so when I saw the holographic sickers were the current sale I knew my little disco ball design would be perfect. Unfortunately, it printed with most of the colors looking very unsaturated and in some areas pretty much non-existant. I'm sure this could be becuase of the layering and opacity of the uploaded artwork, however, the proof looked much better than how the stickers turned out. The stickers look much less vibrant and color saturated than the proof did. I'm hoping this is just an issue with the holographic stickers, but it's a bummer as the ones I ordered aren't the quality I require to sell (or even give away) to clients. I would not order again if these quality issues continue, so I may stay away from holographic if color is involved, which is dissapointing.