Similar happened to me once. Check your outside shower. If the valves are open, but the shower head closed, the water will "co-mingle" and be a blend at points beyond.
2014 RAM 2500 Laramie 4x4 Quad Cab w/Cummins Turbo Diesel, 2009 Rockwood 2607, and 3 'yaks!
300W of Suntech Solar, a Rogue MPT-3024 Controller, and a Xantrex PW2000 Inverter