Am I doing something wrong?

When I move the cursor to a gap in my timeline and choose Insert Time, the events move down the timeline -- but they don't quite remain synced up.

In other words, some tracks move a certain distance, while a video track above it will be off a second or so. It's a real inconvenience that, every time I Insert Time to the timeline, I've got to go through everything to the right and nudge all the audio and video layers back into their proper places.

Any suggestions?