Q: Why did my gas lowered after just putting some in?

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Why did my gas lowered after putting in half a tank of gas? It read half a tank after coming home and turning the car off , I went outside a couple hours later to start the car all of a sudden the gas lowered and read as if I had less than what I put in. My car recently had it's ignition coils and spark plugs switched. And have been told it needs a new catalytic converter can this be the problem?

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