Inconsistent print quality between orders

My first order of poly mailers was great with very few printing flaws (in an acceptable margin for the price), but my second order of the exact same product with the exact same graphic was very disappointing and riddled with tons of streaks, misregistration of the image, and lines. Thankfully Sticker Mule offered to reprint the damaged order, but I feel wary about ordering again because of the huge swing in print quality. I’ll be interested to see how the reprints turn out.