Just for a little perspective, a good rule of thumb is that on average people lose about 50% of their excess weight by 6 months, then it will take the following 6-12 months to lose the remaining weight because loss slows the closer you get to goal. Your 50% mark is 45 lbs, so you are technically ahead of schedule probably when it comes to your weight loss. Take a moment to let that sink in and celebrate it! That's a big deal!
Yes, working out for some people slows their weight loss according to the scale because they are exchanging fat for muscle and their fluid balance changes. But, another issue is that some people don't eat enough to fuel their body and workouts when they are in a losing phase, which will also cause weight loss to slow down. You need a session with a bariatric trained nutritionist to help you work out what your target calories and macros are so you don't end up in starvation mode and ruin that nicely reset metabolism you got compliments of the surgery!
Stalls are a normal part of it. I stalled one month out from surgery for 5 weeks. It was really lame and I have way more to lose than you do. But it is all part of the game! Putting too much stress on your body and emotions will definitely trigger slower weight loss too as was mentioned above. This is a marathon, not a sprint...
ETA: Almost forgot---are you monitoring your measurements?? Most of us lose inches when we aren't losing pounds according to the scale. That's because even when the scale is at a halt, our body composition is changing! Take those measurements!!