Comment 8 for bug 190557

I've had this happen many times. As suv can probably predict, it drives me crazy. :)

I've hit it both when entering numbers manually in the edit box, and when scale objects
(even single objects, not groups), with the arrows. It's like a little game to play to get
the exact size you want.

Note that I have the Transforms preference for "Scale Stroke Width" unchecked.
I think it is resizing the object again to put the stroke width back to the un-scaled size.
It should take this into account as you are scaling the object.