3d Molding Polyline not working

[Lighthouse]

I'm trying to show a drain pipe path through the house, with horizontal and vertical turns.  I created a 4" cylindrical molding (but I've also tried it with square moldings, so the cylinder is not the problem.  I can make 90 d turns in plan no problem.  When I try to create a vertical turn, it offsets the molding.  It seems to create the molding from one edge, rather than the center, so when I create a vertical turn it offsets the molding by it's own thickness.  Am I doing something wrong (I hope) or is this a bug?  Plan attached.

3d molding polyline.plan

[Renerabbitt]

47 minutes ago, Lighthouse said:

the molding by it's ow

This is how it showed up when I opened it in X15

[Lighthouse]

huh, that's how it's supposed to look.  I'm using x12, must be a bug that they fixed :-(

[Chrisb222]

4 hours ago, Lighthouse said:

huh, that's how it's supposed to look.  I'm using x12, must be a bug that they fixed :-(

 

Try -1/2" offset in horizontal and vertical (see pics). This is in X12: