Hello. Thank you for contacting the Toolset support.
I tried to search for the address you mentioned "Otto Wagner Kirche" and I found the one post:
- hidden link
Do you mean spiderfy feature (that is used to display markers on same address) is not working? Can you please share screenshot whats exactly not working?
The marker_id should be unique so I've adjusted the marker_id as given under:
[php]
[wpv-map-marker map_id='map-all' marker_id='marker-id-[wpv-post-id]' marker_title='[wpv-post-title output="sanitize"]' marker_field='wpcf-building-address-coordinate']<div class="ott-align-center">hidden link</div>[/wpv-map-marker]
</cow>