Typical of pure nickel wound strings. No big deal, you don't have to be fretting too hard.. they're fairly soft.. and it just shows you been playing allot.. time to change them. I change mine about every week or two cause of this.
Its prob always happened you just never noticed as bad. Pure Nickel strings are soft and have a great warm tone... and it's better than your frets wearing down.
Well, I've had problems with frets causing kinks in strings early in a string's life w/ DR Pure Blues, never with any other pure nickel string.
I would guess Nickel strings vary quite a bit prob with nickel content and type of wind. Plus there's a difference between nickel plated and pure nickel. DR Pure Blues are obviously pure nickel and soft... what are the strings you see not doing this? Could they be nickel plated steel?
I stopped using DR Pure Blues, despite quite liking the feel of the them, because not only did I find the tone a little muddy and ill defined compared to something like the Pyramid Nickel Classics, but also I had problems like the kinking at the frets on even nearly brand new strings, or difficulty with getting great intonation and tuning stability with them.