Ok, I think you guys aren't fully tightening the compression fittings at the nozzles.
The rest of the fittings in the kit are push in "instant" fittings that require no tools.
To tighten the compression fittings, you'll need two 9/16" wrenches.
Here's a picture of a fully assembled fitting that has been tightened.
Here's a picture of the fitting disassembled. You can see that the ferrule has compressed onto the hose.
With the fitting properly tightened, the ferrule is on tight enough to hold up the weight of a steel plate without pulling the hose through.
If the hose came out of your fitting, it probably wasn't pushed in far enough or tightened properly.
Regards,
Sean