Same, with Firefox on a Linux desktop, even after enabling JS.
Edit: apparently it uses Oklab/oklch() [1], which is supposet to work in Firefox since version 113, but does not seem to work in 115. Or possibly it also uses something else that breaks it.
If you can’t scroll down to see various swatch sets grouped by shade then you’re not seeing what you’re supposed to see. Works fine on FF for me but I don’t have Android.
Maybe a broken cache on an edge network serving up a bad asset to only some geographic areas, or something that was served broken for a moment but got cached.