WP wrong path when posting, updating etc…

Hi guys, my wordpress makes different path when posting, installing plugin or even updating wordpress so every time I try to post or update it gives me errors like this ones:

Warning: Cannot modify header information – headers already sent by (output started at /pwp/wp-admin/post.php:9) in /pwp/wp-admin/post.php on line 241
Warning: Cannot modify header information – headers already sent by (output started at /pwp/wp-admin/post.php:9) in /pwp/wp-includes/pluggable.php on line 1178

This folder : /pwp/ it doesnt exist in ftp, cpanel. So practicly I get wrong path and I think that is why I get these errors. Its imposible to add plugin or update anything via /wp-admin.

Maybe this pwp folder was existing in the past not sure and something confuses wordpress. Note: I updated wordpress via FTP to see if this solves the problem. Also disabled all plugins and error was still there.
So my question is how to remove this folder or lets say how to fix this so I have the correct path when posting or updating ?