Mesh bug that I dont know how to fix

Got this mesh issue where the shading on a mesh of mine, it has a patch of the mesh that goes by a different shading rule than the rest, I tried converting the union to an .obj to see if that fixes it but it doesn’t, what is wrong?

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Your picture doesn’t really explain what we are supposed to be looking at. Is it the grey area ahead of and underneath the door?

I’ve had issues when creating a Mesh in Blender where extended Vertices or Edges seem to get out of alignment and cause a noticeable edge in the shading, but not a different colour.

Is this a MeshPart with a Texture or just each colour is a separate Mesh?
Does your Mesh have a Texture in your 3D program and it’s somehow being imported into Roblox along with the Mesh?

So this is a union currently, yes that grey portion is what I am referring to. its flush and there isn’t an extruding portion at all. Also it is shading just the lighting makes it look like its a color.

Ah, sorry. I missed that you said it was a Union before.
When you make Unions now they’ve gone back to the previous way Unions were constructed.
If you use a different Color Part or Negated Part in the Union it will take on that color.
There is a checkbox in the Union Properties for UsePartColor, check that box and you’ll get the entire Union looking the same Color.