Platform, device version and operating system:
WIndows 10 x64
Screenshot or image:
What you were expecting to happen, and what actually happened:
Yellow exclamation sign under “Raid Boss” icon relates to the PvP screen (and disappears, if I scroll icon list at the PvP screen).
Obviously, it must not appear at the main screen.
How often does this happen? When did it begin happening?
Always this week. Probably, always since Immortals was added.
Steps to make it happen again
Um, run the game?