Otzi, while my primary concentration is calories rather than macros, I had a similar experience once. Went out on my birthday for three days (chuckle) and ate all kinds of shellfish and beer and fried fish and tequila, etc. Came home and the scale showed a 10 pound increase. On the third morning back from that decadent little outing, my weight was back to where it was when I left.
My guess is that once we get away from our own cooking, we get a lot more carbs and in my case a whole boatload more salt than we're used to using, so we puff up. And water is heavy. You should see the loss pretty quickly. Good luck!
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine