My fault, I realized that later -- sorry! As for the rest of the domains you need to import, it'd be best for you to submit a ticket for any future domains being brought in with incorrect permissions, and we will manually correct them for you from our end.
Sorry for such an inconvenience. As Ipstenu said, it's very odd that the cPanel importer would use a different owner. We're going to be looking into this and if we discover a reason for it, I'll be sure to let you know.