Leaflet MarkerCluster disabled on all maps if more than one map is shown per page

Hi Rik,
I've tried putting a map view into a views field in a view, and although it works the view starts giving strange errors, and it appears as though all clustering on all maps on the site is broken.

Not sure if the below helps but its the error I get. It happens when saving changes in views. Then I have to press 'back' to save the change to the view.

Please PM me if you'd like me to send you a URL to look at - I'd rather not post it publicly during dev.

Many thanks!

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