I think this is quite normal and why people recommend
not measuring yourself every day
This is well-intentioned but has an inherent problem: any single weighing could be skewed to either end of the scale.
Instead, I weigh myself almost every day and record it, but I don't attach meaning to any given weighing; I look for a moving average.
I also use a Tanita bodyfat-estimating scale, which helps distinguish day-to-day variations due to hydration level (e.g. a lower bodyfat estimate combined with an upward tick in weight just means you are more hydrated).
This is what I do (I keep an eye on a rolling fortnightly average), though I don't currently measure body fat, but some people can stop themselves fixating on single results which leads to unnecessary worry and micromanaging - incorrect micromanaging at that (eating less when the extra weight that day is mostly water, and cutting out more of the better things when eating less so ending up with a worse nutritional balance).
Instead, I weigh myself almost every day and record it, but I don't attach meaning to any given weighing; I look for a moving average.
I also use a Tanita bodyfat-estimating scale, which helps distinguish day-to-day variations due to hydration level (e.g. a lower bodyfat estimate combined with an upward tick in weight just means you are more hydrated).