Do you have your hose connected to a shore water source? If you have a water filter, check under the sink and make sure it is not leaking. I had a similar problem. Make sure you also don't have a secondary water filter under the bathroom sink. The pressure of the water coming in caused a very small leak in the water filter, which overnight, filled up the bottom of my kitchen cabinet. Yours may be doing the same thing, and leaking over to the bathroom floor. The tanks are normally under the floor, so you shouldn't have a leak above them. Also check to make sure your water pump is not on and perhaps leaking.
