Drilldown from State to County on Map Viz

Hi,

We have a requirement where drilldown should be done from state to county on a USA map viz. I see PBI does not have any viz that works drilldown  on map. Tired building a custom viz, now we are able to drill down from State to County but facing a issue.

When drilled down from a state to county, the counties in the state are showing and the similar names of county in other states are also showing up. I tired different ways but still the same issue.

Can you please suggest any other possiblities?

Thanks in advance