fuel needle problem

friends, I have a 2006 peugeot 307 1.6 comfort gasoline car, I have been using it for a long time before the atiker tube warning light is on. I encountered a problem while driving my car today. Since I had a lot of gasoline in my car, the fuel gauge was small, but after using it for 20 minutes, I noticed that the fuel gauge showed half a tank, what is the reason, do you think it might have happened after falling into a few bumps and pits?

The gas tank may have temporarily aired. If so, open the tank lid and shake the vehicle. If the situation is changing, it means there is air left