Why is my skill dropping?
There is various way which made your stats drop. You may infect some debuffs, which you can see in this page you have captured. Or you may equip some equipment. But I think you may infect some debuffs, like tried.
Tired, Exhausted, Drunk, Náusea, Withe Fever and another tinks make you skills drop...
Rest until the morning o make a proper medicine can help.