XF 1.5 Member since December 31, 1969??

Our Forum (www.Chromeheads.org) has gone through several iterations over the years. The most recent big change was converting from DISCUS to Xenforo a few years back. We were hacked bad, but were able to salvage about 95% of almost 20 years of posts, photos, etc. But something has been nagging me for a while. Many members (220 of us) who were already Forum members pre-dating XF (including me from 2006), now have a "Member Since" date of December 31, 1969! I'm 100% sure its not a Xenforo issue, and had something to do with the conversion, but any idea why this has happened?
 
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Not the question you were asking but having been "hacked bad" in the past, I'm curious as to why you haven't upgraded from XF 1.5, which is end-of-life, to XF 2.1.x?
 
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