Geometry rotates after export to SAT - bug or geometry issue?

[Art V]

Today I was exporting a 3D model to a SAT file and noticed that some items had rotated after the export, e.g. a horizontal pipe was sloping up or down (depending on the item) instead of staying horizontal. This rotation was not only in the SAT file but also in the Vectorworks file itself after the export.

I would think this has to be a bug but it could also be related to the objects/geometry causing things to happen as a result of translation to SAT. When converting the objects to NURBS the problem was solved but in the long run this is not a sustainable solution when the number of these objects increases.

Has anyone else noticed similar behaviour? Would like to find out before filing a bug report.

[Art V]

Update: it is probably a bug with the parametric tool I was using, it happens when the shape is updated in 2D plan view and for some reason the Z-value changes to 0. When updating the shape in 3D top view this does not happen.