Sorry for the delay. Yes, that is expected behavior if you are not allowed to make the same changes.
The sub account can only make the edits to the pages that they are allowed from the main account.
So if you are still having the same issue, my suggestion would be to reach out to the main account owner and then ask them to go to Manage page of the application you need the access to and add the additional pages you might need.
This would be done under the Manage > Access Management section.
Of course please let us know if you have any additional questions on the same.