I'm having some problems with the shading on a curved surface on my model, in with the studio light with lines you can clearly see how the shading goes weird around the bend, I can't figure out how to fix it. Thanks in advance! :D

[![Model with wireframe][1]][1]


[![Model with studio MatCap shading][2]][2]


  [1]: https://i.sstatic.net/kzcDe.png
  [2]: https://i.sstatic.net/r9S4Y.png