The fact that most of the images are distorted in some way seems significant. Perhaps faulty firmware was sent out?

I know someone who programmed cheap Chinese GPRS printers used in food ordering, he messed up his deployment script and gave every device the same ID - a special test ID that would return every single order no matter which take-away it was destined for. So basically, every order went to every take-away.

This scream of a lack of firmware QA more than anything else.