On a full map re-set the monks would go away, or be reassigned.
Under certain circumstances, the monks seem to reset their dialogue but without a complete map reset. That means when you talk to the monks again at the same spot, the game shows you completed the first round of questions, making the monks ask the second set.
It's not fully clear if the hiccup is always repeatable (maps do timeout for reset), or if some of the times it's happening, it's just the monks appearing at the same spot by chance. Randomness does include repeats.
Dosen't hurt game play and doesn't really offer a game changing reward so not a vital issue.