Symptom

When trying to add a post or pin to the newly loaded Map Locations, requests become unsuccessful and the following Console warnings are encountered:

[DOM] Found elements with non-unique id

DevTools failed to load SOurceMap

Explanation

This was a reported issue that has been fixed in the latest version of MapifyPro. 

Resolution

You will need to update to the latest version in the Plugins area of your wp-admin. For any issues you may encounter, please follow the below guide which provides the steps on how you can manually update  MapifyPro:

How do I manually update my copy of MapifyPro? – MapifyPro Support