I'm setting up a friends 9-stringer and while restringing I noticed the string was thicker at one part... Looks silly but maybe it's supposed to be like that?
Yeah they're taper wound, typically to fit through smaller tuning posts. However they're usually supposed to taper AFTER the nut, not before it. what's the brand of string and what guitar is it? Could be the guitar had a longer scale than what the set was designed for.