To oversimplify, temp dropped below the dewpoint and water condensed on both sides of the fabric, no doubt aided by your breath and ground moisture. If you were camped in a swale, cold moist air would have hugged the ground and flowed towards you, making things worse. Stronger wind could have resolved things but I don't know how to order that up.

It's sometimes possible to game the local microclimates by camping on a rise or hillside terrace. Not always an option though.

The covered breezeway at my house once had metal roofing that would basically rain on foggy, still winter days. The plastic it has now never does that, so the material has some kind of effect but I can't quite suss out why that is, other than heat conductivity. Do fabrics differ, e.g., material, coating type, color, thickness..? No idea.

Live and learn/rinse and repeat.

Cheers,