[GIS] Diagrams not drawing on QGIS

Question

I'm trying to draw a pie chart on QGIS, over a polygon layer. This pie chart should include data from 6 fields in the attribute table. These fields contain the percentage of several categories of data and all of them sum up to 100% (I've checked it personally). However, the diagrams option in layer properties gives no result. Anyone knows what may be going on?

Answer 1

Try turning off simplification for the layer, under the rendering tab. That might be causing invalid geometries which prevent the diagrams from being placed correctly.