The printing quality looks different

I have been using sticker mule mailers in every size for years now. I'd say there's probably a 90% success rate with them. Sometimes the sides have holes, sometimes there's weird banding in the prints, but this time it was the printing quality defect. I've had this same background printed on many size bubble mailers and poly mailers from sticker mule and they've always come out perfect. However this time, the printing looks like the ink was running low or their print head wasn't purged or calibrated correctly because the printing is super dull and grainy compared side by side to other bubble mailers of the same design. Of course I'll order again, but the hit and miss with quality you have to be vigilant with.