My wp website is domain.com/wp, my custom login page title is tesa it contains the Login & Register Customizer plugin shortcode, if I type my website url in firefox it loads the tesa page and login pop up and url will be domain.com/wp/tesa, if ido the same in incoginot it loads the custom page login popup but the url remains domain.com/wp . if I load tesa page in a standard chrome while logged in my website, tesa page is blank.

it can't be the plugin , what is it?