I agree with JGMarr, do a leak test on your mag, that's more than likely the issue.
Get a clear bowl and fill with water, let the mag take a swim and watch for bubbles. Bottom; your main seal is blown, fix with blue gasket maker from Can Tire. If it's the top, then the seal on your striker valve is blown, try to take it apart and silicone the rings over night and put it back together.
Re-lube the mag when your dunk test is done. It's made from an alloy metal but chemicals in the water may produce ill effects.
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