Thanks for replies.
My sw version is 2015 Pro, and I started with Urban Chic template
Problem appears every time if I use user defined walls, for example if I copy the wall type Stucco-Thick , change it's thickness and then use it as a default wall then the dimensions are positioned wrong.
But what's strange , the problem appears only if all exterior walls are user defined or copied - if I have at least one default wall type in plan then dimensions are just right.
Andy