Access Profile provided to the team member is not working as expected

Hi,

Could you please look into the below mentioned issue:

I have the following access for a user:

1. User A is the owner of OpptyA which has a Custom Object 9 as a related information section.

2. User A has added User B in the OpptyA Team and we have given him the 'Full' Access level.

As per the full access profile, user B has following access level:

Oppty: Read/Edit/Delete

CO9: Read/Edit/Delete

CO9 as a related information section of Oppty: Inherit Primary(its not working with View access also)

However, the Full access profile is not working for the customer and the userB have only Read/Create access to CO9 which is a related information section of Oppty.