Map won't center correctly when using spiderfier

[resqonline]

I am having trouble with the spiderfier - as soon as I activate it, the map won't center and fit to the bounds, instead it just shows somewhere around the equator (the blackened part is where my json file does an overlay)

I am not getting any errors in the console, though.
As soon as I deactivate the spiderfying, the whole map shows up correctly. But I need a solution to show overlapping markers (sometimes there are five or more in the same spot). I am using Advanced Custom Fields plugin in WordPress to manage the markers with the Google Maps field and included the Spiderfier function like this:

    // Spiderfier
    var oms = new OverlappingMarkerSpiderfier(map, { markersWontMove: true, markersWontHide: true, keepSpiderfied: true, legWeight: 2, circleFootSeparation: 50});

    function omsMarkers( markers ) {
      for ( var i = 0; i < markers.length; i++ ) {
        oms.addMarker( markers[i] );
      }
    }

    omsMarkers(markers);

You can take a look at the whole skript here: https://github.com/resqonline/code-snippets/blob/master/google-maps.js

[jawj]

Looking at the whole script, the markers variable appears to be set to []? Do you need to use $markers instead (and is this an array of Google Maps Marker objects, as it will need to be)?

[resqonline]

yes it is an array of marker objects

[resqonline]

@jawj just noticed that the error only occurs on start page with the map, it seems on sub-pages (taxonomies and such) everything is fine. I am using the same template tag on all pages including start page, so I am not sure, why it throws an error on the front page but not on other pages.

[resqonline]

@jawj finally found the issue! it seems it mattered, how and when the individual functions were called... good heavens, this is why I don't like JS 😄