I got the perk that is supposed to give me two more skill points every turn, as in 2 more than the last... but i got it at lvl 4, and I'm lvl 14 and still only get 15-16 points... Is this some sort of witchcraft?

correct me if I am wrong but if you have not raised your intellegence since then that number will not change. Your intellegence determines the skill points between levels that perk adds to that number

I have 7 INT so i should get 15-16 without the perk, but with it i should get two more per lvl, 4 = 15-16, 5 should = 17-18, and so on.

Incorrect. 10 + Int/2 skill points per level. 7 int gets 13/14 skill points. 2 added to that is 15/16.

Its a geometric sequence people, unless i read it wrong.

No i read it right, I have the CE guide right here, "you gain two more skill points every time you advance in level."

It's 10 +(Int/2) skill points per level. If you're reading anything different than that, you're reading wrong. 7 would normally be alternating 13/14 skill points per level. If you're alternating 15/16 then you're precisely right.

You're right, I read it right, interpreted it wrong, Thanks.