If the option is not exist from backend setting, by right it shouldn't populate that comment system on the page.

Perhaps you can provide us with your following site details at http://stackideas.com/dashboard/site so we can better have a check?

- Joomla backend access
- FTP access
- database access

I don't know if it populating comments. I bought Komento and I'm trying to integrate it with Easyblog (I want only one comments system). I didn't seen any comments plugin below blog post after setting Komento integration on, then I set many comments systems and the Rscomment tab appeared after the Komento tab (screenshot1). I don't have Rscomment plugin anymore and I don't want to use it but in database, in params its value is set to "1" (screenshot2). I think that setting this value to "0" (or removing this parameter from db) would resolve this problem but I don't know how to edit this. It's impossible by phpmyadmin ("Current selection does not contain a unique column. Grid edit, checkbox, Edit, Copy and Delete features are not available.") or dbreplacer.

OK, I added primary key to "name", and edited params and set comment_rscomments="0" and it working. But it shouldn't be like this. You should set this param to 0 before deleting an option from configuration site.
Best regards,
Robert.

Thanks for reported Robert, we will see if we can do something about it in the future.