Clustering seems buggy

Hey there!

Thanks for sharing your great plugin with us. It’s working just fine on a food blog I am currently developing. But I encountered some strange behavior:

At a point, where there were 6 posts clustered together, the zooming in by clicking on it did not work properly anymore. Instead, after a second click on the cluster, all pins and clusters disappeared altogether. I thought it cured itself after adding some more posts, and now (on 21 clustered posts) it happened again.

Does anyone have a suggestion, why that might be?

PS: I tried clustering on different zoom levels, and different browsers – the issue stayed the same ??