RLS set value - undesired behavior

Hi 

I thought I had RLS figured out but I am just puzzled here 

I have some sales connected to a Product dimension table with a Category column (A, B, C etc)

I have created a role with the only filter being applied to the Category column where [value] = "C"

Without the role active, here is what I see on a new report page

also here is a snap of the page level filter for the Categories

If I apply the role I see this 

As you can see the table on the left got filtered correctly and is only showing C, however, the total value on the table as well the visual on the right remains unfiltered. 

In addition, the page level filter now only lists C as an available option and it remains unchecked. If I do check it then everything filters correctly. 

After some tinkering I discovered that if I manually select each category on the page level filter before applying the role

than when I do apply the role it works as intended

Can someone explain to me what is going on here? Am I doing something wrong?