Managing Legends in multiple Maps

I have a dashboard with 9 maps of the same borough divided into ward boundaries.  Each map analyses a different metric (these metrics are measured in the same way.  The are coloured using a heat gradiant to denote that highest and lowest.  I have a slicer for all the wards.  The problem that I am having is that when I click of an area all the corresponding area change colour to match that of the metric that I have select.  So for instance  Area 1 in Map1 is yellow, Area 1 in Map 2 is Red, Area 1 in Map3 is amber.  When I select area 1 in my slicer all area ones become yellow.  How do I stop the areas for the yellow when select slicer.  Pic attached.

Many thanks in advance