My theory is that you did the extra loop. If you got to the third SAG thinking that you should be closer to being done (because you thought you were just doing the 50), then that might explain it.
But, yes, you may never know.
at least it sounds like you never got off the route.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher