I've not heard of this problem before, but I noticed in your second video that you can see it is grabbing the wrong one because the text of the scene you're moving is displayed. I've not been able to reproduce it.
What version of Windows are you using?
My guess is that you have your screen at 'normal' resolution, which is probably too high for Dramatica Pro. What happens if you select a lower resolution display to make Dramatica display larger on your screen? It might make the target area for selection be more accurate.
If this works, I recognize that this is a poor solution for the problem, but until we have a Windows version of Dramatica Story Expert it may be the only way to work around the problem effectively.