There is a wired boundary around the big hole, everywhere else is fine, the small hole does not have this problem. Does anyone know what causes this problem? Thank you!

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  • $\begingroup$ maybe recalculate the normals? $\endgroup$ – moonboots Jun 29 at 4:45
  • $\begingroup$ normals are facing the right direction. $\endgroup$ – BlenderNueva Jun 29 at 5:27
  • $\begingroup$ maybe share your file? $\endgroup$ – moonboots Jun 29 at 5:30
  • $\begingroup$ Can you check and share what the subdivision modifier is set to? $\endgroup$ – Craig D Jones Jun 29 at 12:03
  • $\begingroup$ I have trouble uploading the file here. The subdivision is 3. The normals are right. There are detailed images uploaded to the original post. Thanks, everyone. $\endgroup$ – BlenderNueva Jul 4 at 20:52

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