Cluster marker cannot open because two listings occupy the exact lat/long…

Anyone else have the problem where a cluster marker cannot open further because two listings occupy the exact same location (lat/long)?

Unfortunately I cannot ask the owner of the site to manually update these anomalies (e.g. to change the coordinates slightly) because they’re determined to make a complete listing wipe/reload from CSV each time. And, because there are a lot of listings like this that share the same location, it gets tedious fairly quickly if they had to manually change coordinates for each of these.

Fyi, the coordinates are not uploaded with the CSV, they’re set automatically by the GEO Coordinates plugin by sMarty (which gets erased every time they wipe/reload the listings). Any creative ideas how to get around this?

Thanks and regards,
Jesse