Problem when changing mesh to SkinnedMeshRenderer

Hello. I'm using Unity 2019.3 and 2019.6 and I got the problem in both versions. As shown in pictures, when I change a mesh on the editor of a SkinnedMeshRenderer, the mesh totally broke. The first picture show the original rigged character with 3 meshes. Then i delete the "Uniform" SkinnedMeshRenderer, create a new one and reassigned the uniform with the exact same settings. The uniform then is wrong. The problem also appear if i change the mesh with any other one and then change it back to the original one. How could I fix this? It is really important for me swapping meshes for this project, I did it before with older versions of unity and I cannot figure out what is wrong this time.

https://mega.nz/#!oERxDAIA!QamcPNXwh8cBLcCA1WrpXypluJNNbp1a-q9aaecdqKc https://mega.nz/#!5JR3WKaJ!63HcQBWxg--7fheYwqMkddevFMmuYxazpz9S2Q6mT08