Any suggestions or where should I look for an error? The login plugin is active and it doesn’t give any error, custom routes are not set, everything is default in the plugin.
it worked before, but with problems like logout is not working etc.
It worked before. What did you do between that state and now? You updated it? You updated Grav? Moved the site?
No changes have been made to the plugin since. The website is currently in a subfolder on the domain, maybe thats causing the issue?