I tried to shut off what I thought was spa return (it was set to like an 80/20), but when I turned the filter pump on, the spa started filling water in immediately. So I tried to turn the valve the other way, thinking maybe I shut off the pool return instead of the spa return, but the valve wouldn’t turn. It goes back to the 80/20 position. Is this normal? I’m complete newbie so I have no idea what I’m doing...