What are these weird lines on my mesh?

haven’t been here in a long time, so I may have missed some things.

I recently started working on an old game again and changed the mesh to a new one, but when I did all these lines appeared and I don’t know how to remove them. they are visible in studio, both while it’s running and not, and in the actual game. the mesh in blender however does not show any of these lines and does not contain any textures that would cause these lines to appear. how do I remove them?
image

they appear to be where I attached a sphere to a cylinder, but also down the back of the cylinder. please help!

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it has something to do with humanoid :confused:
if I remove humanoid the lines disappear

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