top left menu links go to not permissions sites only ...

Hello,
I have something strange here. I dont know if caused by set up or plugin or ... IDK.

If I allow "User accounts may be registered." then user's top left menus (after logged in) looks like this:

My Sites - My Blog - Dashboard -> goes to main admin domain.com/wp-admin -> So - You do not have sufficient permissions to access this page.
and there is also:
My Sites -> SiteName -> Dashboard -> domain.com/username/wp-admin -> You do not have sufficient permissions to access this page.
and also:
SiteName -> Dashboard -> domain.com/username/wp-admin -> You do not have sufficient permissions to access this page.

If I allow "Both sites and user accounts can be registered." links in the menu are like above, but works better instead:

My Sites - My Blog - Dashboard -> goes to main admin domain.com/wp-admin -> So - You do not have sufficient permissions to access this page. (Why is it there?)

Caches are switched off now.

Can you explain and help?

Thank you in advance!