Dynamic Grouping for Tree Map

Hello,

I am trying to create a tree map that has dynamic grouping. The measurement is sum of total hours spent on certain categorys. Some categorys would be customer service, auditing, etc. The top 90% of total hours spent will all be default colors set by microsoft. But I would like to block the bottom 10% into a gray color. The issue is when I filter on one of the employees the conditoinal formatting doesn't change color based on the employee I filter on. It doesn't adjust the conditional formatting to the employee I select. 

Here is how the map is unfiltered. Which is what I want. 

This is what happens when the dashboard is filtered by employee. You can see those original grey boxes are still grey. I want the conditional formating (lower 10% grey color) to adjust when the table is filtered. 

Want it to look like this when filtered by employee. 

I'm not sure if this is possible or not. Thank you!