v15.19 Double Navigation Track & Directional Arrows

I was navigating a course on my last run.  On one section of the run, I noticed that there were two navigation tracks displayed on the map.  The course certainly did not cover this section more than once.  The first screenshot shows the double track/arrow.  2nd screenshot show single track later in the run.  For what it's worth, the double track section was during a Live Segment.