Hi, official card carrying member of the SLC here!
You're losing at about 1.2kg a week, which is around what my average weekly loss has been.
First up, that is good weight loss! It's nothing to be discouraged about, that is a healthy, good rate. It's easy to buy into the rapid-loss dream, and I absolutely don't begrudge folks who have had their "honeymoon period" and had weight "melt off" - genuinely thrilled for you! But I think it's vital to go into WLS managing your expectations (with rate of loss, loose skin and hair loss). I went into it pretty zen, though I have had my perfectly human moments of wishing I was losing faster. BUT, I'm losing well, about 7 months out and have lost over half my excess body weight and have dropped 4 sizes. Results aren't always on the scale - it's important to remember that!
I'm not just a slow loser, but I'm also a serial staller. I have lost count of how many stalls I've had - stalls and I are on a first-name basis. In the first four months I was stalling every second week, for at least a week at a time. I feel like I earned a damned trophy for my stalling expertise. But they always break (even if they go on for weeks), and that's what you need to keep in mind. Stay off the scale when it happens, focus on the good things like feeling better, clearer skin, the clothes that are starting to fall off you.
And ultimately? You're not alone. Your experience isn't weird, or wrong, or abnormal. Don't compare yourself to others, manage your expectations, slow down and breathe. Enjoy all the small victories the journey brings.