I see nothing in your post that tells us what kind of rig you have so we are guessing.
My guess is the hose without the valve is the overflow for your fresh water tank and the other hose is the drain for the fresh water tank.
As to why water is coming out the overflow...
The most common cause is the check valve in the on board pump (to keep water from filling the fresh water tank while connected to city water) has been compromised with debris.
Often when connected to city water, if someone happens to cycle the 12v pump, a piece of debris can stick in the built-in check valve and the city water will fill the fresh tank.
Turn off city water and crack a faucet to relieve pressure.
Turn on 12v pump and crack a faucet several times to cycle the pump and turn 12v pump back off and see if problem goes away once city water is turned back on.
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2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2017 Ford F-Series SCREW 4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
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