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Date & Time: 2019 08 17 09:20 GMT+2 and other times over a few days.
Frequency: radom
World name: Moogle (home world), but also when visiting other worlds.
Character name: E'renndis Harper (other people reported this too)
Retainer name: N/A
NPC name: N/A
Monster name: Gunitt, Safat and others
Class/Level: WHM/80
Party or solo: Solo
In-game time: Various times
Area and coordinates: Various maps (Tempest, Coerthas central highlands just to name a few)
Housing: N/A
Steps:
1. Travel to map with known S rank.
2. Message "You sence a presence of a powerful mark" does not always appear.
*Add more steps if necessary