looked at the styles site - demo where we keep the styles - dont' know how it is there, will check the exported style again and correct it if its there.
all of the templates in the Registration Template group should be the vBulletin default.
in the admin cp -> Styles & templates -> click Style Manger.
expand the templates for the style -> find and open the Registration Template Group -> if any of them are edited you just need to revert them back to the vBulletin default template.
( highlight the template name - the right side has a Revert button )
any other problems or errors please do let us know.
thank you