Issues in generating dynamic components

Here´s another issue folks (perhaps someone is able to help):

I´m located in Germany. So I tried to make a document wich makes the actual problem clear in english language.

It´s not the first time, I have to deal with a similar problem:
sometimes SketchUp seems to calculate on base of other fields, that I didn´t tell it to use.
In this example one of the groups in my dynamic component doesn´t work properly, positioning this group when the Length of the whole component should change.

I will add the .skp of the component and a PDF with the discription of my problem…have I described it in an understandible way?

dynamic component.pdf (416.7 KB)
4-Kant-Stahlrohr.skp (136.7 KB)