thanks for your reply.
Yeah, I figured out those are the things, and I tought that those shouldnt affect my lightning or contrast or anything, but the second after I pressed the "OK" button and started
rendering my scene was 5 times brighter then normal and since then I havent been able to get it back to the original state
Guess it was just a bug / flaw somewhere, happens lol
Anyways thanks for your reply, I'll try to get it all back and if succeeded I will post the solution in here