When I draw a stair into my model I draw in a starting and ending point line. Then through the stair connection tool I pick the bottom end and then the top end of my line. The software creates a stair. On my latest stair I had the stair started at a +2" elevation but the software started the stair at a 0" elevation. The treads were where they were supposed to be but the software added 2" to the bottom of the stringer to get down to 0" elevation. How can I correct this?