Rate - drop item

Hello, i have only question about RATE BOSS DROP ITEMS example if is my value number 2 what it mean? all boss will drop everithing 2x? or mean only grand boss special item (baium = 2x baium ring) ? or gloabl drop? This very important question thank you please answer.

# =============
# NORMAL RATES
# =============
# Rate control, float values
RateXp = 25.
RateSp = 25.
RatePartyXp = 1.
RatePartySp = 1.
RateDropAdena = 25.
RateConsumableCost = 1.
RateDropItems = 15.
RateBossDropItems = 2.
RateDropSpoil = 25.
RateDropManor = 5

any elp for it please? i have value 2x but player when kill boss they got drop only 4 keys + EAS thats all its wrong :-(

Afaik the droprate doesnt effect the drop amount.
It effects the drop chance.