Few things:

1100 calorie deficit is a bit extreme. Shoot for 500, or maybe 750 if you are pretty heavy.

How much protein did you eat? You'll maintain more muscle if you eat more protein.. consider 50% of calories from protein. Lifting weights also helps with maintaining lean muscle mass.

Alcohol can mess a lot with fluid retention. A good strategy for that when measuring progress is to weigh yourself each day but only look at the average weight over two weeks to see if you are progressing in the right direction.