I just learn from npc for 33.3 skill. I tried to cook a stack of raw fish, 2500 pieces. No scroll used for extra skill gain. 1st failed, gain 0.1 2nd failed, gain 0.1 3rd success, gain nothing, 2500 raw fishes turned to cooked. I tried several times but still cannot gain as it said "check with each individual piece on skill gain" Used up 10000 raw fishes, only got 0.8 skills Is it normal or the skill gain is broke?