Have you some value for following module options?
- Filter By coordinates
- Sync with User List menu item
The map is also not working on your website under "User List". Please see the screenshot.
In our site the maps works, but we have enabled the option "Sync with User List menu item". So it will show position of currently displayed users, but displayed users on first and second page have not set the map field or have a privacy for this field set to "Private"...for example in the page 3 or 5 you will see some result.