Mesh display problem

There seems to be a display problem with my mesh. how can I solve it ?
Mesh.3dm (115.1 KB)

Some of your meshes have self intersections and non-manifold edges.

Using the Analyze Edge command you can see all problems. A quick fix would be to use _AlignVertices with Distance to Adjust set to 0.1, scale the self intersecting faces with a factor 0f 0 and then delete all mesh faces / edges inside your shape.

I did it one one of them. I’m using Rhino 7 and I’m not sure if you have the same options in Rhino 6. Apparently a lot of mesh tools were improved from 6 to 7

Mesh.3dm (201.2 KB)