Hi, Seansale!
Tomasc has your situation pretty-much covered! Often people can be caught in such a trap when editing video, When you set the "scrubber" to the end of the content on Video Track 1(master track), scroll down through any other added video/audio tracks, even down to the music and voiceover tracks, then scroll along the timelines to see if there's a bit of stray video, audio or anything else that you may have missed, then simply delete it. Something I've found useful in PD14 is, when you line up an item, be it a video or audio clip, title or effect, you can position it to be flush with the start or end of a clip on another track by means of a thin black vertical line that appears on the timeline(useful for cueing PiP video inserts, music, titles, etc.). If that line does not appear when you shift the material along the timeline, forward or back, it's very likely you've placed material on a track well beyond what should've been the end of your video.
Cheers!
Neil