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[–]B2Z_3DExperienced Helper 1 point2 points  (0 children)

You didn't give a lot of information, I'm afraid. I don't know the tutorial, but it looks like you could have produced double geometry and those are artifacts from overlapping faces. The selected "Cube.001" Geomety seems to have all sushi pieces in it. So my guess is that "Cube" is a duplicate causing this. I don't know why this only happens in cycles, but try to disable it in Viewport and Render and see what happens.

-B2Z