Wow, very noticeable difference!! Nicely done and I hope you find that visual progress encouraging! 😁
A few thoughts- 1) you've just passed a month since major surgery and your body is working hard to recovery, repair and get you back out there to your active life 🤗 I'm just a couple weeks from my bypass and working on talking to myself/honoring my body, sometimes with humor 😅 but acknowledging "my body is amazing, and strong, look how well I'm recovering", stuff like that. 2) your food plan looks good to me 3) while you can't actually build brand new muscle without being in a calorie surplus, I wouldn't be surprised if getting back to working out after a lull could cause some micro tissue tears and some water retention 4) need new scale batteries?
Lastly, I don't know if you'd have access to one somewhere, but a BodPod uses air displacement (something like that) to accurately measure fat vs non-fat. It was so enlightening to me to see that pre -surgery, I legitimately could burn 3000 cals on an active day, even at 5'4 😅 because of my build. Anyhow, I just needed to know that, so when the scale wasn't moving I could say "science!!" If I'm eating 500 cals and burning even just 2000, I will eventually see it on the scale or tape measure. The body is just going to process weight loss and healing in its own sweet time.
All that to say, it must really be disheartening to not see the numbers change after all your hard work and I hope you find some answers. Maybe for now frame your loss since Christmas or New Year's, because you've lost so much! Good luck to you!