We're seeing that when we create an .maj file from revit, then open it in autocad and look at developed lengths, that on straight duct there is some length added to pieces - in some but not all situations. If we delete the part in autocad, and redraw, the problem corrects itself. There seems to be no reason / method to the parts that have a longer developed length than expected.

We're using Revit 2019. Any idea what causes this?