It leaked out while cleaning it.If black gunk is leaking out, you didn't clean it well enough.
With white lightning touch holes, the “edge” of the hole is quite thin. Hard to get a good seal.I have found that a green twig whittled down will plug the touch hole better than a toothpick, I have 5/64" touch holes and toothpick will sometimes leak.
I put a folded paper towel up against the plugged touch hole and held in place by a spring clip to catch any leakage should it occur.
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