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What did you use to seal the fittings around your regulator? If you used teflon tape, that would be my first suspect; if a small piece managed to find its way into your solenoid, it would prevent it from closing all the way, and thus, you will see some gas.

However, since you also mentioned that after shutting off the main CO2 tank valve, you still see bubbles, it may simply be due to residual gas that is still present. My CO2 still goes for a couple minutes after my solenoid shuts.
 
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