Subdivision surface problem 1 Please help. As I am facing a problem regarding this modifier.
all other edges and faces are fine but few edges and facing are stuck to Vertices/ Edges and are not smooth. The crease of all edges is 0.
You probably have flipped normals.

You can check your normals from Face Orientation under Overlays. Blue is outside and red is inside.

You can fix it in Edit Mode by pressing a to select all vertices and from Mesh tab under Normals press Recalculate Outside.