Fuel gauge

How do they normally function on these almeras?

When I start the car it goes up a bit, waits for a second, then a bit more, then waits another few seconds then up a bit more then when I start driving it goes up again to what (hopefully) is the correct fuel level...

Are they supposed to work like this or is mine broken?
 
Mine the same,the fuel gauge moves up to what you think it the correct level then 5 mins later it's either a tad higher or lower.
 
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