G string with old string sound

[Asllan Pizzatto]

Good evening, friends. Here's the thing: I bought a set of Rotosounds SH77s a few months ago. I took it to my luthier, he put the strings on, and right away I noticed that the G string had an "old string" sound, completely dull. Well, I asked the dealer here in my country for a replacement string and they gave me a brand new set. My luthier put them on, and when I got home, the G string was dull again... Now I'd like to know what could be happening. I tried taking the string off and putting it back on, and I didn't see any difference. Maybe my problem is with the Badass Bass bridge or the tuning machines. Has anyone else experienced a similar situation? I've read elsewhere that it's a problem that can happen with Fenders... By the way, my bass is a Japanese Fender Steve Harris.