BJ, ours gets water far hotter on propane than on electric. So it's not surprising you see this seepage when on propane but not on electric. I agree with those who said first try clearing the valve by unseating/reseating it. Just be very careful as the hot water will shoot out of that thing if the pressure is not first relieved. It can give you serious burns. Be careful. I'd recommend shutting off the heater and letting it cool a few hours, then open a faucet as noted above, then open and close the pressure relief valve a few times.
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