Biking under the canopy is tough for locking in specific segments, especially if they are short or near many other trails. But this is not really a Strava issue but an accuracy issue with the GPS on the devices we use. Out in the Stow Town Forest we have several segments and many are repeatable with regularity but sometimes you don't get logged in on a segment. Hogboy, that GPS track you are showing is insane - hard to see what is going on there especially with all the radiating straight dead end lines.