Map - Clustering not Working

What I was trying to do:

See many items grouped together in a cluster

What I expected to happen:

See many items grouped together in a cluster

What actually happened:

I see a bunch of posts together but can only select one , without any cluster

Important to note

It seems that clustering is working, but it only appears at an altitude which is too low. It must start clustering sooner, as the group if posts is ganged up far too soon before clustering kicks in.