Could someone please explain why one business has a brown marker, whilst the other has a red marker? If I zoom out any further the brown marker disappears and Google maps then only shows the businesses with the red marker.

Notice the purple link in the image below is second on Google's ranking, yet it's hardly ranked for the map at all other than the brown place marker. I'm trying to get it to appear on the map to the right of the search like the other nurseries have done. Any advice at all is deeply appreciated!