Thanks guys you have put my mind at rest, although I have never had a bike do this before!
I always overfill my tank... is this bad and should I stop?
The tank heats up the fuel and the vapor rises to the breather hose and turns back to a liquid as it cooled in the hose and some rolls back in the tank and some out the hose. Nothing to worry about.
Of course the biggest problem are the drips making stains on my front pathway which is a pain!