Hey everyone, i have a model of a fork i made in blender and for some reason parts of the mesh are somhow broken and generate these weird surfaces that are not actual geometric faces, like in the photo

but when you look in wireframe it's all normal

only in edit mode there is this shadow like surface

if i try to subdivide it goes entirely crazy

and this is what happens to the mesh

what is causing this? how can it be fixed?
plz help
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thanks for the help