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You get too few hit points as a FMC
The maximum hit points of a fighter/mage is 7 points per level before constitution bonuses. If you add a cleric to the mix, you should get more hit points, because the maximum of a cleric is 8 points per level. And 8 > 7. But no, the total hit points is even less, 6 hit points per level. Moreover, the character sheet even says, that your total maximum is +7 per level. But it isn't. In the beginning you get 7 hit points, which is correct. But after that +6 per level.
The mechanism should maybe save the decimal points to the next level up and add them to the total.