Hi, The legend field in the 'map' visual is not working properly since the may update. I used to be able to choose which color a range was assigned in the legend but since the last update (may)...
I can't provide you with the actual file (confidential). Have you tried clicking the 'legend' off and on again? I found this to trigger the dissappearance of data colors. (after wich the 'legend' options doesn't work anymore either)