This might sound silly, but I wonder if when they were deciding the loot tables they said something like “2% for treasure map glamour, 1% for mount, 5% for coin, 10% materia, rest ribbon prism” and whoever implemented it did 2% per map glamour instead of 2% to reference a table.
Disregarding the strangeness of using prior field expedition items in the wrong place, if it was intentional surely it was brought up that it would needlessly make the new exploration zone feel already familiar?