Unfortunately, this bug has been around for years. I'm afraid nobody really knows how to fix it.

https://hub.qgis.org/issues/8002

For me the grass tool v.voronoi works great. You can find it in processing.

Raymond


On 23-03-17 20:47, Khandoker Maniruzzaman wrote:
Several years ago I tried to generate Voronoi polygons around a number
of points. I think I was using QGIS version 2.10. The result was not
satisfactory (Nearest Distance interpolation in  raster gave better
results). There was one polygon with no generator point in it while an
adjacent polygon had two points. Another generator sat on a redundant
line dividing the polygon into two parts (is it okay to attach a
screenshot?). I found that this problem has not been solved even in the
latest version of QGIS.


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