As Top_Kat says, yes, it's all very normal. I'm someone else who gains weight on liquids and mushies after each fill. I can't explain it, but it happens each time.
Bear with it and you'll see a difference once you move onto solid food again.
I had my op at the beginning of august. I've had three fills so far, and I'm just starting to feel a little bit of restriction. It takes time to get to the sweet spot with a band.