Atlas Map drops...are terrible?

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Phrazz wrote:

Having trouble with maps too.

Also having trouble understanding the map bonus. As I see it, the bonus doesn't increase the quantity of maps, but rather the tier of maps dropped. But the text says:

"XX% Chance for maps to drop one tier higher"

Not "increased" chance. Flat chance. So, what's the difference between 100% and 125%? Yes, I'm stupid.

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New Atlas Bonus: 1% chance for a map drop to upgrade by a tier per map completed (up to 123~125%). Higher than 100% means it can go up a second tier. Capped at maximum level that could drop from that monster (same as before). There is no reduction to map drop rates.