After retopology, wired issue happened always

[crazygod (John Wu)]

Checked again and again ,don’t know where is the issue

Modeling_Panda_issue.blend (917.9 KB)

[picto]

Check the face orientation. It looks like a problem of inverted normals.
Shift + N = Recalculate Outside (with all the polygons selected).

[picto]

I hadn’t noticed you’d shared a file.
It is a face orientation problem :

[crazygod (John Wu)]

Thank you @picto
It saved me again. Never considered the normal changed when retopology.

[picto]

I would recommend to always model with face orientation activated and just change the colors like so :

(Preferences / Themes / 3D Viewport)
Source : https://twitter.com/Motionworks/status/1552064636316700672