All the receptacles and lights work with #17 on and #21 off. Everything works the same with #21 on and #17 off. Is that what you're saying? The circuit is somehow double wired or fed from two circuits. It's not right, but you may be able to cure it by removing the hot wire from one of the breakers. I think you shouldn't rely on advice you get here. You need an electrician. Could be a disaster waiting to happen. My son bought a house that had similar weird issues. We ended up re-wiring a few circuits. He's an electrical engineer, and he never did quite understand why or how it was working.
Yep. I'm leaving one tripped for now.
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