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so, I'm kinda new to 3d modelling (I've done some simpler low poly people and objects in the past) and I keep running into this issue with the Subdivision Surface modifier where it leaves this seam like mark on the mesh. enter image description here

I tried looking at just the wireframe it looks like some vertices just bend in(?).

enter image description here

enter image description here

I have no idea what this is and the mesh doesn't look like it has any extruding leftovers.

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As you can see some faces are flipped, you need to recalculate the normals (AltN or Mesh > Normals > Recalculate Outside):

enter image description here

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  • $\begingroup$ Oh my god, that was totally it, thanks a bunch! $\endgroup$
    – user128400
    Jul 26, 2021 at 5:32
  • $\begingroup$ @user128400 Anothe thing: apart from moonboots' solution, before I checked the face orientation I was wondering why it's not looking smooth although I chose smooth shading in Object Mode. What most people don't know, you can set smooth or flat shading even in Edit Mode for selected faces - if you set them to flat, they won't be smoothed in Object Mode sometimes. So if you are still experiencing this, best would be to hit A to select all faces in Face Select mode, right click and Shade Smooth. $\endgroup$
    – Gordon Brinkmann
    Jul 26, 2021 at 6:55

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