There is no way to overfill.
Remember that temperature plays on the volume of a liquid: You fill your tank, fuel is at about 10-15C. You park your car for your day at work where it is chilly these days, tank and fuel are now at about -15C, you will have a notch removed on your gauge. You come back from work and you are stuck in traffic, car is warm and doesn't much fuel meaning tank is warm up by warm fuel going back in the tank, fuel is now at about 40C, you get back your notch or, you parked your car overnight in your garage, fuel is at about 10-15C, your notch is back.

Fuel gauges are really not reliable, this is just an indication of about how much fuel you have.

If your gauge moves one notch, rarely two, from warm to cold or vice versa, that is ok. If it moves more than that and often, you should tell your dealer.
If you fill your tank and it is indicated only 3/4 for example, you should tell your dealer.