I'm not sure on exora layout but I'll just give it a shot.

There's a access door to access your fuel pump in the tank from the inside of the vehicle. On top of the fuel pump normally there's a pressure or vent valve which vents and equalizes the pressure of the fuel tank when operating.

Problem Comes when your access door is not seal tight. Some of the gasses may sip and come into the car during fill up. Result, you smell more petrol smell even a long drive after fill up. Problem 2, fuel pump is not fully secure on the tank resulting constant gasses escaping. This is much apparent whereby you will notice your fuel consumption drops slightly worse than normal.

There are other cases but personally I think it's either the door not seal or you're just being slightly sensitive. Cause you mention it only occurs fueing fill up. Have your local mechanics perform a check.