https://imgur.com/a/6GeouSz
You can see there's something in the second picture, above the "Hide menu" in the right down corner. This "something" appears only on with this helmet and only when some ornament is equipped over it. At first I thought the ornament was to blame since this "thing" goes away when you remove an ornament, but then I put a different ornament on and it came back. This needs fixing, clearly some artist's bad job.
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This is known and is affecting multiple Hunter helmets