The map element is really pretty poor, and I would avoid using it if you can.
Address, lat,lng and PostCode all work for me. But sometimes the map will just not display. At all. This may be because it finds an address it can’t geocode. Quite why it is doing it on the fly (most other platforms do it on the database) is beyond me.
What you can maybe do is add in a limit on the markers, as this seemed to work for me although I don’t know why. Raised this via support, and as usual they just shrugged.
For anything Geocoding related , bear in mind Adalo can’t even sort on distance despite saying they are “mobile” app platform, I would look elsewhere.