If you’re holding tanks are overflowing into the bays somethings wrong they should be watertight you need to get them fixed the only way you will know if it’s water coming from the holding tanks is to fill them completely up and watch for the water to be dripping into the bays clean both tanks completely and drain them and then fill one at a time completely full until the water is backing up into the shower in the toilet and if there’s a water leak from the holding tanks it will show up like I said there should be absolutely no leaks from either tank if it’s a 2020 it’s under warranty Winnebago will fix it