Using custom field to map and adress, updating this field creates a new map instance in _agm_maps

I use a custom field to auto create and append a map to a post. When updating this fields (and the post) it creates a new map for the post in the database table _agm_maps

This has the unfortunate result that on a map showing all locations, there are multiple instances of the same post on that map.

On the map for the single post, it seems to take the newest version (and the correct one)