@JP-d Glad you enjoyed the lock!
Determining the nearest point can indeed result in 2 being picked rather than 1 because you are so close to 1 that it should not matter and it's actually preferred to go to 2
Activity feed simply matches your privacy settings!
If tracklogs / routes are set to private, no one will see them (only you).
If set to friends, your friends can see it.
If public, all MRA users can theoretically see it.