Portfolio Grid Displays Entry Display Question

In page with Portfolio Grid sections
Section 1 (upper) Categories selected :
ONLY assigned to Case Study <category 1> AND Agriculture <category 2> AND Healthcare <category 3>

My Goal:
1) Display All Portfolio Entries assigned to 1 or more of the 3 categories ONLY
2) View and Sort Case Study Entries by either ALL or <Agriculture + Case Study> or <Healthcare + Case Study>

Issue:
The Portfolio Grid ALSO displays a Portfolio Entry thumbnail which is assigned to Agriculture <category 2> + White Paper <category 4> a category I DID NOT select in that Portfolio Grid setting

Question:
Is there any way to display Portfolio Entries that are ONLY assigned to Categories selected in the Portfolio Grid settings

i.e., When I ONLY check the category Case Study AND Agriculture AND Healthcare – the Grid displays Portfolio Entries that are ONLY assigned to
Case Study <category 1> AND Agriculture <Category 2>
AND
Case Study <category 1> AND Healthcare <Category 3>

NOT display Entries that ARE assigned to Agriculture <category 2> AND White Paper <category 4> which was NOT selected in the Portfolio Setting

Thanks