Hi,
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If you prefer to have no popups when a marker is clicked, please leave the Title property empty.
You can use the DataString property to have additional data associated with a marker. -
The AEventData.Marker.Title behaviour you explained is by design. If the marker Title value is changed, the updated Title value is automatically included in the event parameter the next time the marker is clicked.
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Please note that unfortunately it is currently not supported to update the marker title value when using the OpenLayers service.
This is a limitation of the service.