Textures messed up

[Jetsky]

Hi, I have a problem with some parts of armor and don't know what is causing it, here are some pics

In this case, the nails are the problem

in this one is the fingers, and in other armors it is the feet, what is causing it and how can I fix it?

also here

I have done some tests and I see that the problem is in the mesh it self, not the texture