Archicad 23 origin offset on IFC export

[POTS]

Hello all,

We are using Archicad 23, 7000 NED.

When exporting an IFC, we get an offset in the Z value. Wd don't know why.

The IFC translator is set to be "Match IFC site location with : Archicad project location". Which elements / parameters can create an offset of the origin ? Thanks in advance.

NB : We can solve it with putting a survey point object and change the translator option, but at this point I would like to understand why this happened or if this a bug.