What is wroooong with meeee

I have been on Ozempic for 20 weeks now. I’ve gone from 280lbs to (at my lowest) 239lbs. Last week is when I weighed in at 239lbs. I just did this weeks way in and the scale told me that I am now 247lbs. How is that even possible? I haven’t changed the way that I’m eating in the last week, if anything I’ve been eating better. I’m starting to worry that my body is building up a resistance. Is that something that can even happen?