No need to explain, I do the same all the time (roughly aligning trails with strava + garmin), but yeah in this case it was just multiple parallel paths in close proximity, which could have been seen with aerial imagery since there isn't tree cover there. Fixed by adding way 1202683830 if you want to see. Obviously on the heat map that would just show as one big blob, and I'm not sure the garmin is always accurate enough.
Also check out the "CT ECO Shaded Relief" elevation layer -- it can be far more accurate than Strava or modern gps for aligning hiking trails.