i've bought a washburn w16g11 with a peavey backstage amplifier. I'm left handed, so i turned strings and pickups (humbucker on bridge and neck). after two days, when i swich on the lead effect from the amplifier, something started whistling, and from headphones whistles turns in drone. all these noises stops when i put a hand on the strings. what the hell is happened?

sorry for the bad english, i'm italian ^^'
bad ground
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