You may notice on your map that some polygons have duplicate labels.
If you imagine that your map is a series of small image tiles being drawn in your web browser, by default each tile would have a label for every polygon or part polygon that it contains. To reduce duplicate labels, we have configured some settings on the server to reduce the number of duplicate labels as much as possible. However, there are some limitations as to how far we can remove duplicate labels and you may see them in some parts of your map from time to time.
To take full control of labelling, you can use a Custom SLD to generate labels that are forced to display only one label per polygon, setup custom label collision spacing, chain multiple attributes together to make longer labels, and customise the width of the label. See Custom SLD for more details on using SLD for your labels.