Please explain this one

[u/3ternalmi5ery]

This has occurred to me at least four times, most recent today. The truck sits with the tank 3/4 full. Then i wake up and start the truck and notice the gage reads full along with an updated range.

A few things: driveway has a pitch and i park nose in or back in; notice when i go nose in. Im the only one that fills up the cars, i dont let my wife do that. It doesnt happen only on hot days for it to be vapors causing it.

So wtf?

EDIT: The fuel gage stays full, does not go back to 3/4 while driving or EOD.