[Inkscape-user] Lengthing line causes it to get thicker.

I am new to inkscape and I noticed something I do not understand. I draw a line with a certain length and thickness. But, if I change the length (y) of that line thru the toolbar, the thickness and the y position will change. Plus, if you then change the thickness, i.e. height, sometimes it will not take that entry, but substitute another and have to change it several times before the value you want is retained.

Example, create line 2.5" long with thikness of .006". Modify it thru the toolbar to a length of 7" and the thickness increases to .014" and the y position changes by several thousands. Why is the thickness changing?

Does this make sense?

tj