The questions Simon asked are critical to trying to diagnose the issue.
Unwound G strings, played open, are well known for what I call "sonic weirdness" (that's a technical term btw). It can be anything from saddle buzz to resonance above the nut (or resonance behind the saddle). The source of the sound can be very deceiving as well. What sounds likes it's coming from the bridge, can actually be nut related, and vice versa.
I will say that more than once, I have fixed G string weirdness by simply replacing the string. Sometimes they just come out of the factory wonky (even with my personal faves D'Addario).
Also, if you're buying Artist brand strings, THAT'S most likely the problem. They're rubbish. I bought some last year to try ('cause who can pass up a bargain???) and they were horrible. They didn't intonate and had wonky G strings!
I'm interested in hearing more about what's going on.
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