Why are the stated size of my app updates so different from actual download size?

This morning, for example, I initiated an app update for a certain web browser which listed the update at 58kb. As I'm watching the progress it reaches "24% of 56.48MB!" I have 3 different phones (same OS) but only 1 seems to have this discrepancy. I should add it mainly involves web browser, messaging apps, 1 ENCRYPTED messaging app, and 2 VPNS, as well as some IP tools apps. Am I just being paranoid? This is probably month 4 so …

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