My registration information was changed to another shooter for Steel Challenge Match

I am the Match Director for our SC matches. I was registered and squadded for the upcoming match. I got an email stating my registration was edited. I looked at the match and my squad and my name had been changed to another shooter with his email address who regularly shoots with us. I went in and edited my registration to my name and email. What happened? (I have emailed the other shooter to see if he registered today and to let him know to reregister if he did.)