Create a verification system on all posts on the map and a way for Admins/Moderators to see the broken ones, then access and edit the field causing the issue.
There is already a verification system in the forms preventing users from missing fields, using too many words, etc. Perhaps that can be repurposed to also check the ones on the map, or the database.
You can see an example of a broken one by searching for me, just south of Lisbon, Portugal
