Multi site Privacy not recognizing privacy settings

I'm trying to create an intranet so users of a subsite can't access content from the main site, but after saving and applying the changes to all the subsites I'm still having the same issue where a subscriber of subsite1 can access to the content of the main site except the dashboard which shows the following message:

But the user can access the content of the main site without any issue, for example this URL http://mathhosting.com/blog/content/do-you-remember-real-no-ops/

Tried to apply the solution explained here https://premium.wpmudev.org/forums/topic/error-when-hitting-update-all-sites?replies=7#post-1218388 but it didn't work.

Thanks in advance!