Why will the fuel door light not go out even when it's closed and the gas cap secure?

I just got this car, and the only thing I can come up with is that it's not a warning light, but simply a reminder that the fuel door is on the driver's side of the car, where the "arrow" is pointing. Not sure if this is the case, but it's the only thing we can assume. The light is the same color as the rest of the normal display which seems to say it will remain on.