Thank you for your replies.
Yes, the repeating "stretched" pixels, not the white border, maybe I didn't explain well enough.
It's not only happening with the cell noise but also with other noises with the same inputs like in the screenshot.
Unfortunately it's very noticable in the result and when I apply it to uvmapping it's like there is a seam in clothing where there shouldn't be a seam.
It's sure is possible it is a bug, but maybe there is a way to obscure the stretch?
Formula change and variantion change do not improve.
Noise distortions unsuccesful, I even tried with offset cell source and other pattern in the u/v inputs.
But I loose the effect completely.
Clueless
May The Forge Be With You