Are you using the latest version? Because if you are, when you unlock the bars a dialog box pops up at the top that has a checkbox for enabling/disabling sticky bars. Uncheck it and they won't stick or snap while placing them.
Tried the snapping feature and there is a bug when you do the following:
- place one bar aligned to the horizontal middle of the screen (bt4 snaps the bar to the middle, all normal here)
- now try to place another bar below that one and snapped to it BUT also aligned to the horizontal middle of the screen. It doesn't work because it seems BT4 can't currently handle snapping to 2 different "anchors" at the same time. At least it can't handle snapping to the middle of screen and to another bar above or below.