Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
While wandering around Toussaint, Geralt did not neglect his vocation and the true core of his existence, namely, pursuing and slaying monsters. Having found a notice on a notice board, posted by a merchant guild beset by some beast, the witcher decided to go to the appointed spot to learn about the details of the matter.
