Not normal. Hard to give any advice, though, without seeing (and feeling) it in action. You could as always post a few pictures, but I don't know if they'd show anything abnormal anyway.I always end up with 2-3 inches of water in the cockpit
There have been harder and softer bungs through the years, and the softer ones leak less. I don't know if there's much variation available at a given time, though.could you find another bung to try?.
That's the tightest fit in the system and it's not where it leaks.maybe apply some sealant to where the center pin pokes through if it doens't fit tight enough.