There is a bug where the shield symbol for blocking stays visible even after blocking. Its just a visual bug, it doesn’t mitigate any damage unless they are actually blocking.
You're referring to the alliance icons. I think it's in health bars or name plates. Check settings.
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Can you be more specific about what it looks like and when/where it appears? Maybe post a screenshot? There's several things in the game which use shield icons and since the most obvious answers have been eliminated it's difficult to say what it is without more information.
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