You have a lot of locations and hotspots is trying not to crash your browser or server when you view them.
go to the dashboard -> option on the right and enable the custom tiles.
Also go to your category and select a color for the dots for the custom tiles. Now refresh the page and you'll again see like 20 hotspots, but you'll also have small dots where other hotspots are located.
Also check the documentation:
compojoom.com/support/documentation/hotspots/ch05#id1443440
Let me know if you don't understand something.
Daniel