Flour packed vs. sifted can make a huge difference!
Straight out of the bag, it is more compacted, even if it says it is pre-sifted.
Not sifted vs. sifted once, twice or thrice ... changes how much weight is in a cup.
Or perhaps I should say, the weight lessens, as you go through the comparison.
So much shrinkflation has happened, that one needs to keep an eye on the labelling.
It can all look the same, but may have changed ...
... and we mistakenly, just go with the flow and a-s-s-ume! OOPS!!