Play for an hour or so... just do quests, smash them out... at some point the pats disappear and don't show up until you /reload.

@Gogo1951 do me a favor... next time that happens turn on Questie Debug and run this...

/script QuestieQuest:GetAllQuestIds()

If that redraws the NPC PATH line... let me know.

I have a feeling these patrol paths are not redrawn when you switch continents/enter/exit a dungeon. Did you do one of those before you noticed they disappeared?