This is a WAG, but if there is a back flow preventer at the city water connection it is possibly installed backwards. This can be checked by putting a shutoff valve between the hose and city water connection. Turn the valve off and the hose spigot on. Then turn the valve on and listen for the sound of the back flow preventer closing.
Again, this is just a WAG.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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