Ink issues are usually caused by USPS's high speed sorting machines. If these cards get exposed to the belts for even a millisecond longer than they're supposed to, they're at the risk of getting abrasions. Sometimes, using a thicker paper stock actually makes the problems worse. This is a very unfortunate reality of mail in the United States.
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It is an industry-wide problem that has had numerous studies on it, and it definitely is not an isolated incident for our printer or for our mail pieces. Take a look below:

I sincerely apologize for any inconveniences this may have created for you. If you have any additional questions or concerns please do not hesitate to reach out to us via the chat.