I checked everything and got to the following conclusion.
In the v-card template it has the following lines;
$gmmaPart1 = $fieldsObjects['field_street']->data;
$gmmaPart2 = $fieldsObjects['field_city']->data;
// $gmmaPart3 = $fieldsObjects['field_federal_state']->data;
$gmmaPart4 = $fieldsObjects['field_postcode']->data;
$gmmaPart5 = $mySobi->title;
$gmmaSobi_id = $mySobi->id ;
$gmmaPart6 = '<b>'.$gmmaPart5.'</b><br/><a href="
localhost/index.php?option=com_sobi2&sobi2Task=sobi2Details&catid=0&sobi2Id='.$gmmaSobi_id.'&Itemid=" target="_parent">View Profile</a>';
$gmmaPart7 = $fieldsObjects['field_latitude']->data;
$gmmaPart8 = $fieldsObjects['field_longitude']->data;
Problem is, all these variables, exept from the title and id vars, are emtpy. I tried an 'echo $gmmaPart1 (and so on) and all gmmaPartx variables contain nothing.
I'm sure the fields are defined as custom fields with the exact same labels.
This seems to be the problem. If I create fake-data instead of the $gmmaPartX variables, it works.