This is most likely happening from a stray property that is making the Mapping zoom out to fit all listings on the map. The stray property will need to be removed from the report to bring the mapping in closer.
Please do the following to correct the map:
Step 1: Select EDIT on report in question.
Step 2: Select LISTING on black bar.
Step 3: Locate listing on map that is out of the closer grouping. Select listing marker on map to see address.
Step 4: Locate listing address of property in question, in list of properties underneath map.
Step 5: Unselect listing from report by UNSELECTING check mark on right side of listing information.
Step 6: Publish report by selecting PUBLISH on black bar.
The Map of All Listings would have originally looked like:
After stray listing is removed: