HanSky: Maybe because you finished with 6 gold?
For everyone, it seems like the amount of money you gain into your treasury is half of the money you have left at the end. EXP seems to be half of the exp all your units got.
Skipppppppyy: I think for each turn, whoever goes first is randomised, so if it went like
Turn 1: Kaos, You
Turn 2: You, Kaos
you would see a 'double turn'