All jeans bleed though, that's just the nature of indigo dye. Indigo is a very poor dye which is why jeans will bleed and why it's easy for you to rinse off.I am noticing blue jeans coloring rubbing off on my Goldne Brown case. These are old jean that dont bleed too. The marks come off with water but that isnt a good sign for this case imo.
You're probably noticing it more on this specific case because it's textured and slightly rough (since well, it's leather) so whatever amount your jeans bleed is higher because of friction. Doesn't help that your case is a light colour either.