Dual Axis Map Filtering

Hi All,

I am having issues with creating a map in Tableau. I need to have the postal code always show. However, when I filter on order priority - if all orders in that postal code were of the priority I filtered on then the postal code disappears. Is there any way around this?

In other words, I want to be able to filter the marks of one of the maps in the dual axis map separately from the other.

I have attached my attempt at recreating my current problem with the superstore data. Notice when filtering out the High Order Priority points the entire postal code in western South Dakota (along with many others) disappears.

Thanks in advance!