because 1 compressed item = 1 stack of the original item so direct translation is not possible without losing ratios and those are correct.
Wafers are 5/2 times bigger as a stack, so their compression is equally bigger, therefore it only increases by 2/5 as much as tinner copper wire, which makes the number only increase by 2, as tinned ocpper wife increased by a factor of 5. And so on. I do see however yours does differ from mine, mine says 2 compressed resins. Are you up to date?