[Matthew Turner]

That layer was actually called “Blue” and was just a color matte. But upon checking my project settings it looks like the renderer was set to Metal. So I turn it to OpenCL (not sure why it wasn’t on there to begin with) and the lines disappeared.

Also, note that I followed @Joe Barta IV ‘s advice as well which didn’t work at first. But maybe combined with both of these suggestions it worked?

Thanks all!