There is nothing way down the timeline. I've checked multiple ways, including what you suggested. The first time this happened, it added almost 3 minutes of space. So I then re-rendered it a second time and it added over 6 minutes. It's done this the passed 3 or 4 weeks, and last night it added over 8 minutes, and these are all different projects. When I take these videos and put them back in the editor, I can remove the extra space, re-render it again and it comes out fine.
Also, I have tried the "close gap in sequence" and again, there's nothing there, it isn't clickable.