PointStacker - Random locations at different zoom level

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I'm applying PointStacker transformation on one of my layers using Geoserver 2.5.2 and OpenLayers 2.

I know, that I have 7 datapoints located on the exact same location. However, when I change the zoom level the stacked point is moving around randomly.I would've thought that the stacked point's location is calculated by the mean of the vector points being stacked. In other words, if they are located at the same location, it shouldn't move around changing zoom levels.

What am i doing wrong?

zoom level 7:


zoom level 8:


zoom level 9:


zoom level 10:


zoom level 11:




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