I can't reach that WMS link, my localhost is not your localhost
I think you are hitting the zoom-in limit of Kibana. The default Kibana map only zooms in 10 levels. You can change the min and max-zoom settings in the kibana.yml settings (https://www.elastic.co/guide/en/kibana/current/kibana-server-properties.html#tilemap-settings). When you set it to a max zoom level that corresponds to your data, you can zoom in all the way to your local area on the WMS map. You will also see that the dots will start to split up as you zoom in.
The relevant thing to note here is that Kibana shows aggregations on a map (each dot correspond to an aggregation of multiple documents in your index), instead of the location of an individual document. So that big dot actually represents an aggregation value of all documents on the map.