A quick fix for this issue is to initiate the map when triggering the conditional field. You can do so by binding a function to the onclick event of the conditional field trigger.
Edit the field that triggers the showing of the map and add in the Additional Attributes area the following line:
onclick="setTimeout(function(){rsfp_initialize_map81();},100);"
note that you should change the "81" number to match your case. in order to retrieve the "id number" inspect the field and the div...