Since you mention chorus, I guess it's an electric guitar. Any distortion is almost certainly the result of your amplifier. I guess if you had active pickups and a battery that was low on power you might get distortion but, otherwise, no electric guitar actually produces a distorted sound.
Don't know what you mean by "string rattle" - that's a separate issue. Fret buzz is when the strings don't ring cleanly because they buzz against higher frets. Raising the action at the bridge is the obvious thing to try to cure it although there are other causes.
An actual rattle could be caused by something loose. If you think it's coming from the bridge look for loose screws or parts.
Yes, I play guitar too and it happens to me. I don't know why. It's like the strings are touching a fret.
Sometimes with the capo it stop, but not everytime.
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