Got a screenshot so we can see what you're describing?Every time I fly my mavic pro using iPad and view map screen, it appears with a green tint.
Sounds like you have no internet connection so it can't load the actual map content and just shows the default background.
There are 3 choices for map view. The first one that appears once you touch the map icon will be a standard map view, the 2nd and 3rd are satellite views from which ever map provider you initially selected, Google or Apple. I believe you are seeing one of the satellite views.
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