
That was the result of attempting to split all tracks at the beginning point of one of those tracks. The top track split along a slightly different line instead.
The result of this is that when I attempted to paste in some video into the top track, instead of pasting in and bumping all the layered tracks over, the lower tracks were all stretched out under the pasted content instead of moving over with the top track. Other problems include issues where you're trying to get all the tracks to end at the same time, but one ends a split-second before the rest, and you then have to try to reduce the lengths of all of them until they are all finally ending on the same beat.
It seems like this is something that should never happen in PowerDirector. If the "atomic" unit of video is a frame, and all tracks are made up of frames and start on a frame, then they all have to end on a frame. PowerDirector should not be able to split tracks up into fractions of a frame if it can't then edit other tracks down to that granularity. As is, these "ragged edges" have to be dealt with in a very tedious fashion.