[Qgis-user] Elements appear and disappear while zomming and panning

[G. Allegri]

I'm facing a strange behaviour with a very simple layer: 5 polygons, 4
corners each.

The following video shows what happens while panning and zooming the map.
No reporjection applied and nothing changed on the rendering settings.

https://youtu.be/UOfwRlfcDK4

Can anybody spot what's wrong with this layer?
Giovanni
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