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Make sure that you don't have any cheap panel surge suppressors hooked up. They use a MOV that connects across the 220v at the panel and can actually back feed the whole bus. Or as in my house I use X-10 devices. I needed to install an MOV to make certain circuits work with X10. I have to make sure I turn off the breaker with the MOV whenever I work on other circuits as it backfeeds. Another problem you might have is a poor ground system in your panel and it's "looking" for another path to go.
Good Luck
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