Some time ago I completed the side quest 'Proceed with Caution'. The quest required my interaction with 3 lights in Central Shroud. The lights showed up green on the mini map and I did the interaction and completed the quest. Ever since then the 3 lights have been showing up green on the mini map and I can still interact with them although there is nothing to do.

Platform: PC
ISP: Virgin (although it has changed recently)
Type of Internet Connection: Cable
Internet Connection Speed: 30Mb/s
Date & Time: All the time
Frequency: All the time
Character Name: Justalyne Relboron
Race: Miqo'te
World: Cornelia
Class/Skill Rank: All
Physical Level: 50
Area and Coordinates: Black Shroud 29,28 31,30 34,32
Party or Solo: Solo (I assume party as well)
NPC Name: N/A
Monster Name: N/A
In-Game Time: All the time
Steps:
1. Complete the side quest 'Proceed with caution'
2. The lights still show up on the mini map and can be interacted with
<*Add more steps if necessary.>