This seems to be several observations/issues, which makes it quite hard to follow (or know what you want us to look at and what's just an observation along the way), even before anyone starts replying to any individual point.
Please stick to one question per thread.
That's what happens when something is copied rather than moved. Looks like you were holding Ctrl when you dragged it.
Stacking vertical toolbars like that won't work well. It's not something we ever really considered or designed around, to be honest. Could be improved in the future, maybe, but I don't think many people need this, and you can just put everything on a single toolbar.
Menus have a preference for where they open, but if there isn't space on the screen in that direction, they'll open in another direction.
You can adjust it for menus but not for button-menus.