Does WordPress host your site, meaning is mysite.wordpress.com the same as mysite.com, or are they two separate things?
If they really are different, and you have a totally separate site (that simply runs on the www.remarpro.com platform), I’m guessing you accidentally made a setting that the site address is mysite.wordpress.com, so it thinks that’s where it needs to take you to log in. In Settings > General you probably have the wrong information in the WordPress address or Site address fields.
What you have to do is log in to your host’s control panel (like cPanel), edit the databases (like with phpMyAdmin), select the database you have for your WordPress site, choose the Options table, and the top row is siteurl. Edit that line to make the value correct (i.e. https://mysite.com/). That should fix it.
I hope this helps you, because I actually just messed up that setting and fixed it through phpMyAdmin just to write this answer. WordPress really needs to make the Site Address and WordPress Address options harder to edit.