There has been a visual issue with this particular hairstyle since the first benchmark for Dawntrail. I saw patch notes in today's 7.05 update that referenced certain hairstyles not displaying correctly and hoped this would be resolved, but unfortunately it isn't.

I have confirmed with several other people that this is visible to them as well in-game, on a varied amount of systems. It is more prominent in certain lighting conditions but is ever present. I have taken a picture using gpose with the lighting to highlight the jagged looking texture.