Autoboolean leaves thick black lines

I’m making cuts with the autoboolean tool, and it keeps leaving these extra black lines. Does anyone know how to return them to normal?

Thanks for any help

You have ‘Cavity’ turned on in your Viewport shading. This is only a graphical effect, and doesn’t mean anything changed about your mesh

Oh, I didn’t realize it did that- I made boolean cuts before turning it on and they don’t have that line.
Thanks for your reply.

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