I checked that with both server it has 70 results found and MySQL query is also the identical on both the server.
On the following server:
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When I checked the browser console, it shows the following information:
Waiting for Google Maps... search-counselors:590:13
Map Instance Found in 100ms search-counselors:558:15
Init Complete, Filtering Map Markers search-counselors:349:15
Adding Radius Circle search-counselors:367:17
Added Radius Circle search-counselors:378:17
Filtering Marker Entries search-counselors:381:17
Array(77) [ (2) […], (2) […], (2) […], (2) […], (2) […], (2) […], (2) […], (2) […], (2) […], (2) […], … ]
search-counselors:382:17
Valid Markers: search-counselors:386:17
Array(71) [ (2) […], (2) […], (2) […], (2) […], (2) […], (2) […], (2) […], (2) […], (2) […], (2) […], … ]
search-counselors:387:17
Invalid Markers: search-counselors:388:17
Array(6) [ (2) […], (2) […], (2) […], (2) […], (2) […], (2) […] ]
search-counselors:389:17
Defining Marker Bounds search-counselors:396:21
Object { east: -104.691216, north: 39.0999, south: 38.808743, west: -104.880489 }
search-counselors:405:21
^ Bounds Defined search-counselors:406:21
Fitting Map to Marker Bounds search-counselors:408:21
Map Bounds Updated search-counselors:410:21
Updating Markers search-counselors:412:21
Markers Updated search-counselors:415:21
But on the server where you installed the MySQL 8 version, it shows the following information on browser's console:
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Waiting for Google Maps... search-counselors:1081:13
Map Instance Found in 100ms search-counselors:1049:15
Init Complete, Filtering Map Markers search-counselors:840:15
No Query Coords, Radius Circle Not Added
Are you using any custom javascript to manipulate the markers? as with the site where its working it shows the marker array but not with the site where you installed the MySQL 8 version.