Is there a grey indicator tile without any value? It means that the indicator value can be calculated or makes sense just on specific level of granularity of your data, or it can be displayed by specific type of visualisation.
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It might be also necessary to select an object from the map to get the value. It is still possible to click on the indicator tile, drill down the indicator and color the map.

Sometimes you can see N/A values instead of numbers. It means that for specific setting of filters or selected time frame in global date there are no data available. Another reason could be that the structure of data doesn't allow indicator to be computed for selected object.