Multiple Roles for one user not working as expected

I have tried to assign multiple roles to the same user. Each role has specific rights however the rights are applied overall and not for a specific area.

Example: I have an IT reviewer which needs to have access to all submitted ideas however he should not modify any. The same IT should also be able to submit new ideas and modify them only in a specific area.

I have created two roles: one with View and one with View, Create and Edit all details of an Idea. I associated the roles to the user specifying all for the first role and a specific area for the second one.

The issue is that doing this the person have full access to edit all the Ideas not only the ones in the specified area associated with the second role.

Is there a way to handle this type of segregation in Automation HUB?