Model seems to shine in ways it shouldn't I'm new to blender, so sorry if this seems like a rookie thing, but I can't seem to find a solution... A model I've been working on has an eyesore of a shine from certain angles that my specular map shouldn't be causing. I suspect it's an issue with the geometry and not the textures, but I don't really know how to diagnose it. I though it'd help to see what I'm dealing with, so I included an image and a gif below along with a link to a folder containing the files. Any help would be appreciated.
Here's that download link.

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It's a problem of normals that can happen with some imported objects, you need to go in the Properties panel &gt; Object Data &gt; Geometry Data, and Clear Custom Split Normals Data: