[Niagara Particle] Black vertical lines in the Ribbon effect

Why my Ribbon has this black vertical lines, I tried everything and I don’t know how to fix it
(Even with the basic Ribbon Material those line appears)

Also, for some reason, at the half of the circle, the ribbon flips:

image

Those “triangles” are the ribbons flipping to upside down

Solution:

The black lines: the problem was Color mode with random between 2 colors, the “Random” is not for each Ribbon, it change overtime in the same Ribbon

The Ribbon flipping: Change Facing mode from “Custom” to “Custom Side Vector”

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