Along with Nat's good words, be aware that each Videopad release has several versions that install slightly different features. You may be using the one that snaps back, instead of leaving a gap.
If that's the issue, hold down the <alt> key when moving/deleting items. Or, reinstall the program repeatedly (may take several tries) until the gap behavior appears. No need to download again.
To keep tracks other than the one you're working with from moving, lock them. Right-click in the area to the left of the track and LOCK TRACK.