Hello.I have determined a connection problem in walls in Upt 5 - OpenBuildings.
The following link from a private video on Youtube demonstrates this problem.
On a wall connecting two columns, only the second one is correct.
From your video it looks like the Wall placement tool is simply honoring the Bottom Left/Right (not sure which) justification of the columns. With Structural Snaps enabled you should see the same behavior if you were to place beams between the columns instead - each Start and End point will be at that bottom left/right vertex. Assuming that Automatic Coping is disabled, of course.
I'd imagine the simplest method to get what you need is to temporarily disable Structural Snaps and use the element based snap points instead.