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Review Roles. Are you on a network and have a Super Admin?

i didnt know anything about network and superadmin till today. i am on my own vps server and clean installed wordpress. and i am logging with admin account (user id 1)

If you are not on a Network and are having issues with control of your site, review if your site has been compromised and how to fix.

You may be able to work with your webhost to restore your site.

no i am not hacked. this is not a hack issue. there is no strange logs etc plus why do i need a network? i am running a single blog .

I have pointed you towards the most likely reasons why an admin does not actually have admin rights. I again suggest that you ask your host to restore your website to a time prior to this issue or rely in the future on a full backup.