Red icon flashing on Company Leve NPC

[Umo]

Platform: PC
ISP: Telefónica de España (TdE)
Type of Internet Connection: ADSL
Internet Connection Speed: 10Mb/s
Date & Time: Dec. 19, 2011 20:36 CET
Frequency: Always
Character Name: Umo Heima
Race: Highlander
World: Gysahl
Class/Level: Thaumaturge/50
Area and Coordinates: North Shroud > Treespeak (20, 15)
Party or Solo: Solo
NPC Name: Aging Archaeologist
Monster Name: N/A
In-Game Time: 2:10
Steps:

1. Activated "Raiders of the Lost Archaeologist" Company Leve (Order of the Twin Adder) by the designated NPC near Treespeak aetherial node.
2. Made my way to designated Area and Coordinates (see above) and located NPC "Aging Archaeologist".
3. Having "Flame tracer" on Inventory, I used one of them on NPC Aging Archaeologist. I was targeting my character, opened inventory, selected Flame tracer then changed subtarget to NPC.
4. The red icon for enmity appeared right next to NPC's name. It kept flashing the entire leve.

PS: I know I've founding weird bugs today; they are not big issues at all, but they are odd in the end...