I just found interesting bugs [sorry English is not my native language, hard to explain]: - when you read skill book(carpentry), and receive exp bonus, this bonus is still working after receiving next level in some skill(carpentry) for gaining overall experience, until you add gained point to skill(carpentry) [sorry English is not my native language, hard to explain] [EDIT]: so this multiplier bonus is also working for next level of skill, so wilth level 3 book you can receive bonus for level 4 - (about this i am not sure) needed experience point for next overall exp level is not raising when you not add gained exp. point For reproduction: I read book for advance carpentry, and gain 18x multiplier. So i saw all logs which i cut down before(maybe 100 logs). And i gain maybe 7 skills points. And i can continue until i will add 3rd carpentry skill point [EDIT]: after added 3rd carpentry point, i already got over 2000 exp in carpentry lvl 4