I've seen it happen when they don't have a loop in the intake hose line, on any boat. The water will just run into the ballast because there's enough pressure caused by the displacement of the boat. So you could check to see if there is a loop, if not, you'll need to buy more hose and make a loop before it goes into the tank. If that's not the problem then you've got a lot of troubleshooting to figure it out. It's not too common that a hard tank like that will leak, so could be fittings? Hard to say.
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