I think you made a typo somewhere...your "gain" is only 1.2 pounds, not 1.8 pounds, and that's approximately one-half of 1% of your body weight....in other words, it could easily be just normal, fluctuation for you. As for ketosis, any measure of ketosis can be influenced by other issues and isn't a definitive indicator that you're on-plan or off-plan. You've lost 13 pounds in not quite 6 weeks. That's a great start and something to be proud of. Get back to logging ALL of your foods....every meal, every day...so you can have a better sense of what's working and what's not. Hopefully, you've been eating more than what you logged awhile back....you NEED your protein and veggies!!! If you stay on plan, as laid out in the book (!!) and over on the Atkins site, you'll see the pounds continue to drop. Good luck.