I solved the issue for me.
Looks like as with some other theme, the page can load a little bit slower => the JQ inline code was not firing properly.
I updated file: “wp-gpx-maps.php” line: 633 by adding “jQuery(document).ready(function() {
” and “});
” before and after map initialization:
jQuery(document).ready(function() {
jQuery("#wpgpxmaps_'.$r.'").wpgpxmaps({
targetId : "'.$r.'",
mapType : "'.$mt.'",
mapData : ['.$points_maps.'],
......
......
});
Hope it helps