Lbs just based on water weight, even if you are weighing in first thing every morning.
The key is not expect a straight line with a negative slope. Some weeks you are going to add some muscle which often comes with some water weight.
Daily measurements are just points on a scatter plot. It’s all about the trend in context of how much muscle mass you are gaining, maintaining or losing.
Also, metabolism variation is going to happen when you lose that much weight. Focus on your long-term trends and habits you will get leaner, faster, stronger. The plateaus always end.