It makes sense because the dry spots on your floor are better insulators than the wet spots. Voltage is the difference of electrons between 2 parts of a circuit. In this case you are making yourself and the wet spot on the floor part of the circuit. When you move off the wet spot you are opening the circuit, like flipping a switch. In other words, when you are standing on dry ground you are no longer grounded, and the voltage is not attracted to you. Is it a wood floor under the carpet or concrete?
Did you check the voltage between the tank water and the ground on your electrical outlet? You should just be able to touch the voltmeter probe to the screw that holds the faceplate onto your outlet.
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