Why Does my gray water tank have water ?

Another dumb question :)  I’m ready to take my tab out for its maiden voyage this week. I filled the holding tank with some water at home just to make sure everything was working. I flushed just once and ran the sink for maybe 10 sec. just to practice I opened the gray water valve and water just kept coming and coming. Way more than I used. 
?????
2019 320S Boondock Edge

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