Fuel leaking from carby overflow in my 2006 V star 1100

No. Wrongly adjusted float height makes the engine fail to run.
If you get over flow leak (from the overflow hose) your fuel needle inside the carburetor simply does not close the gas supply hole firmly even if the floaters still pressing it against that hole.
That is because the over flow holes on a carburetor are so far above the floaters that even with the float height wrongly adjusted, the fuel needle should stop the gas from overflowing and simply made your fuel mixture too rich.

sounds like a carb problem(running lean/not getting enough fuel) and or your valve clearances need attention.

well it sounds like the float needle is not shutting fuel off whin the bowl is full of fuel you can lightly tap on the bowl of carb an that may make it stop what has happend is the bike has sat you may need to run a little fuel treatment through it or sea foam and that may clean the end of the needle off the way it works when the bowl of the carb fills with gas the float raises a needle valve into a brass seat and stops fuel flow into the carb fuel get old and starts to develop a tarnish on that nice pionty valve an then it won't stop gas the overflows just prevent to much into the motor try some fuel treatment and run it it may fix it self just from fresh gas an being driven worst case is having to clean your carbs still not to bad hope that get you fixed up

it has a sticky flote velve in the card you could try "tapping" the carb and it may free the flote off dont go hitting it to hard just tapping it should free it off
if it wont free off strip cards and clean then flote velves up

sounds like a fuel system problem If the machine has been laid up I sugest you drain the fuel from both the tank & carby remve the fuel line from the tank make sure that there is adequate fuel flow from the tank if this proves to be good you might also want to check the inlet manifold for leaks if it is sucking air this can cause to weak a mixture ie to much air try starting it with the choke closed if it starts on choke it is almost certainly a leaking inlet manifold all the best Geoff