Oh, excuse me, I missed the fact that it's a bike. It's still too early in the morning :-)
Normally no petrol should get into the oil when the bike is stopped. This only happens when the engine is on, because only then fuel gets into the cylinder. Some fuel in the oil is normal, that's because the piston rings are never 100% tight.
Now it depends, if you drive only short distances, then the fuel comes due to the greasing of the mixture with the cold start and the fact that the oil does not become so warm that the fuel evaporates again and can escape over the crankcase ventilation.
If you drive long distances, a workshop should check whether the piston rings are not damaged. If they are too loose in the liner, fuel will get into the oil while driving. This does not always mean that oil will be burned.
You only have the problems after the service life because the fuel separates from the oil and then floats up.
I would be very happy about a rating with 5 stars over the star bar at the top of the page, without this rating the site operator does not pay us experts.