Expired domains' age being reset??

I recently bought about 10 expired domains that were an average of about 8 years old, but now that the domains are in my possession, 5 of these domains' creation date has been reset and is showing as the day that those domains were switched over into my possession.

What the fuck? Anybody know why this would happen? Particularly with some of the domains but not the others...I'm confused.

did you purchased or backorder them ?

The ony way the creation date would change is if the domain actually dropped and was freshly registered. Are you sure it wasn't the "Last Updated" portion that gave the date it was transferred?

I really want answer to this. As I'm planning to buy an aged domain, like pre 2004!