No real shockers, an exponential curve used for levels in most games, you see it turns more linear after lv20 though (current max level is 20).

you can see the loot levels was made to fit the max lv25 build, which is why you only see High level loot at lv20 and lv20 only.

The loot in question is the health potions or mana scrolls that drop when a demigod is killed, with low=750 hp/mana , mid=1500 hp/mana and high = 3000 hp/mana.

Perhaps the loot drops need to be adjusted abit now when the max level is 20, also I think the 3000 hp/mana ones are a bit overpowered at lv20 so perhaps bring them down to 2500.

I would suggest something like

lv 1-7=750

lv 8-15=1500

lv 16-20=2250

and if ever needed

20+=3000