The very bottom hose on the carb is the overflow - do you turn off the fuel when you park up ? Could be dirt in the float needle or a high fuel level that over flows when on the sidestand .
Def not normal and needs to be sorted , can be hard to find where the original leak is , give the fuel lines another good check too.
Def not normal and needs to be sorted , can be hard to find where the original leak is , give the fuel lines another good check too.