It can depends on below issues.

1. Check your listing coordinate and sure that it has exact coordinate. If it’s coordinate is right and it doesn't shown in the map refer to below issues.

2. Check that you choosed listing type and it’s status in shortcode, because listings will be shown in the listings map if their listing type and status choosed and enabled in the
shortcode. For more details refer to below image.

As you can see in the above image, this shortcode only loads listings with property and rental type with status current and sold and leased.