I'm not sure if it's valid for you, but weighing every day tends to have these swings. Most recommend weekly or twice-weekly, or, if you gotta do it every day, at roughly the same time after doing all waste disposal.
I have a scale that just pushes to an app (yeah i hate it too) so i don't need to be concerned with the day-to-day but can still see that sweet sweet
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graph if i need to.