Problem with redirect

Maybe someone will be know.

When I open register page in main domain: http://bloa.pl/wp-login.php?action=register all is working good. But when I use other subdomain or domain, example: http://zalej.baniak.pl/wp-login.php?action=register it redirecting me to http://bloa.pl/blogs/create/ and I see 404 error. How can I fix this?

Regards
KW