Yeah, it was weird.
I filled until the machine shut off automatically. Then, pulled the gas/fuel (@kromicacid: Lol) handle a little out of the tank funnel and continued to pump the fuel slowly until I could see the fuel not go down any more. When I got in the car and drove home (about 3 miles away) and reset the trip computer (both) the gauge still said that 1/16 of the tank was empty. So I go home, then to the gym, then to my brother's which is close by and then on my trip back home, THEN the gauge says "absolutely full". 
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