If you are following the recommended guidelines and making good choices, your body composition is changing, regardless of what the scale says. We all want to see the scale numbers drop fast, but it just doesn't happen that way for everyone. Some people's bodies put up a little more of a fight against weight loss, and there really isn't a "normal" way to experience it. Some people reach their goals in a few months, others take a year or two, but the key is staying the course and really focus on building good habits. A new relationship with food and good habits are what will get you to your goals. The surgery helps, but the effects of surgery are temporary, so we have to set ourselves up for long term success early on.
This is a long game, not a short one. I know it is easier said than done, but let yourself step away from the scale and focus hard on just doing everything right. If you are maintaining a calorie deficit, the fat will burn, and it is burning. Stick with it, and you will reach your goals with time.