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Hi,

I have a point layer with several types of vehicles (column type) and some points are at the same place.
I choose point displacement for my layer style and Categorized as renderer.
When I choose a one-layer symbol for my vehicle type 'CCFM' for example, the point is well placed ( = around the original point when there are other vehicles too).
When I choose to add a second layer for that symbol (for example the default red point of Simple marker), the point is going nuts and is no more near the original point. Surprisingly, the point with the 2 layers symbol is well place if there is no other vehicle at the same place.

Hope my description is clear enough !

I tried it with QGIS 2.18.24 and 3.4.4.