In the smelting skill, the vanilla XP multiplier increases the levels you get from smelting stuff.
Anyway, I've been at 2X for a while, which got me 28 levels from 32 stacks of potatoes smelted. Now, at 1395 XP required for 30 levels, and vanilla XP from a single potato being .35, the 2X making it .7, that math is
roughly correct. Now, at 3X, 30 levels should come to around 21 stacks. I've tested this and only got to level 22. I did 32 stacks out of curiosity and still only get to level 28.
So, my point is, either vanilla XP multiplier is broken or there's some bug, or it's been quietly nerfed.
Please help