This exact issue happened to me. I bought a new clamp, choked down on it a little closer to the elbow, and it was perfect afterwards.
lowes, pex isle, replace the crimp ring
For its new, it could just be the nut wasn’t screwed on tight enough. Tighten the white nut as hard as you can with your hands.
a2d6:
The steel clamp is to far back from the end of the PEX. Cut the old clamp off and replace the ring clamp. When you take the PEX pipe off you should see two barbs ( bumps) on the plastic fitting. Make sure the new clamp is over both barbs before tightening the new ring clamp. Should be all good as after that.
Is it leaking from the pex line or from the connector at the sink ?
That fitting was crimped way to far back. Looks like you could fit another one closer to the joint and you should be good to go.
So you have a pressure regulator on your hose before entering the camper? Could be the water pressure is above 40 and causing it.
If you do then I would re clamp it like others have suggested.
Source: Help with small leak under the bathroom sink. New fifth wheel RVer.
