WEight loss is not a linear process. This is why weighing daily can show you some surprising results! Because it takes 3500 calories to make a pound of fat, you likely did not gain 2 lbs of fat in two days. It's probably water retention, from sodium, hormones, lack of sleep, any numbre of factors could be at play.
May I ask why you chose 1200 calories? If you are trying to lose 60 lbs, and are working out an hour a day, then 1200 calories is likely not enough for you.