Seek bar longer than inserted videos

I figured it out.  Because the modules all had different lengths of videos, I had been doing a bit of copy and paste to quicken the pace.  Apparently, once media is attached to a slide, that becomes the length of the slide, even after you delete that media.  One of my source slides that was getting used as a "blank" had a length of like 20 minutes, so even long after the 20 minute video had been deleted, that became the length of the seek bar.

I'd pop a 5 minute video onto that slide, and assume that was the length of the slide.  wrong.  And that's why things got weird.

Spent the evening creating new blank slides and copying the videos onto them instead.  Fixed the issue.  Lot faster than dragging the slide length from 20 minutes down to the video length.