Map Markers reappear for partially cleared quest steps

In the early dungeons, including Toxiclaw Cavern, the map markers showing the player where to destroy certain objects or monsters would seem to be removed as they were completed, but then reappear on the map again after the character walked far enough away. It was not consistent across quests as most seemed to work correctly (I only recall this in dungeons).

E.g., Destroying the tents and poison pouches in Toxiclaw Cavern and a later dungeon.
A numbered marker would be displayed on the map to indicate their locations, which would be removed as each one was destroyed. If I walked off far enough to the side after destroying one, but before they had all been dealt with, walking back I would see the marker(s) back on the minimap for the areas already completed.