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That vent tube should not be blocked off. This is sometimes done when there's a crack in the drain tube that runs through the gas tank to stop it from dripping constantly. Not really dangerous but not ideal.

You may be getting some gas leaking higher up at another junction and it's mixing with oil/chain lube as it migrates downward.

Oil leaks can be hard to trace since the drip is often far from where the leak is. Clean up the bottom of the motor with degreaser and see if you can find the trail.

For particularly hard leaks to find they make UV dye you add to the oil. Then you ride for a while and look with a UV flashlight. Never used it on a motorcycle but I did use it on my 21 year old car and it worked great.
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