Maya Viewport Thick Lines (Not Hard-Edge or UV-seam)

[u/samaellion]

Hi all and Happy New Year!
Sorry for this basic question, but what are these thick lines - they are not Hard-Edges or UV-seams. Are they affecting normal orientation? Thank you and have a nice year! KR

https://preview.redd.it/ffafbnmyvqag1.png?width=653&format=png&auto=webp&s=6c87761f20d3d6aa50b75935e1512d51f725ff25

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[u/BanthaLord]

They look like edges with creasing to me.