Fingerprinting

I had to get fingerprinted for my summer job at the courthouse. They use a computer that scans your fingerprints into the system (just like CSI, but apparently the technician is tired of hearing about how it's like CSI).

So I got my right hand scanned all together and then one by one and then she moved on to my left hand. That's when the computer started to freeze between each finger and flash the warning "Match found!"

Apparently, four fingers on my left hand are on file. To my knowledge I have never ever been fingerprinted. My parents are sure that they never had me fingerprinted when I was little for any reason and I have never been fingerprinted for a job. The technician at the courthouse told me that it's really odd to have just 4 fingers on one hand on file because usually all ten prints are taken at once. I've emailed the HR person who is in charge of my program, but I haven't heard back yet so as of right now, I'm still really curious about how my prints got on file.