It seems like these forums are not using https, which means all data is sent, including logins, is sent unencrypted to the site. I think this is also what is causing logging in with your Google account to fail. Google complains about Error 400: redirect_uri_mismatch
I know about the issue, but I am afraid to modify anything now since I don’t have too much time to deal with it right now.
If someone can help whit this a will be very grateful
For example, the main web is hosted in github. And you can activate the https.
here is more info: Securing your GitHub Pages site with HTTPS - GitHub Docs
However this forum is hosted in a VM on Digital Ocean, and I am not sure how this change can affect the configuration there.
If someone has experience with this and can help me I will more than happy to jump on a zoom call to set up everything correctly. 