wp-registration issue

I cannot go to ‘wp-registration’ page at all! event after deactivating my plugins!
I was using ‘Theme My Login’ plugin and everything was OK, until I suddenly faced with a problem occurred in registration page. I realized my registration does not show any error if you for instance do not enter any email or even username in registration fields. It just shows you that the registration has been successful!!!
So I deactivated the plugins, but I am still redirected to ‘/register-2/’ when I click on registration!!!?
I even tried to redirect ‘/register-2/’ to ‘/wp-login.php?action=register’, then I just see ‘wp-login’ page.
Not to mention, I can see WordPress default page for ‘login’ and ‘lostpassword’, but I cannot go to ‘/wp-login.php?action=register’.

SO, WITH OR WITHOUT PLUGINS I CANNOT GO TO ‘/wp-login.php?action=register’!!

I appreciate if anyone comment on this problem!
Thank you.