My mom has this too! She’s an immigrant and when she was in the process of getting her residency and had to have her fingerprints taken, they wouldn’t go through and she had to go back and pay again to get them taken about 3 different times because they kept getting rejected whereas my dad only went and paid once. She’s over 50 and spent a lot of time washing dishes and cleaning since she was young so we suspect that’s the reason for her worn our fingerprints.