Number on the left is your base stats, and number on the right is your stats after various states taken effects. On character creation your character is naked by default, which gives two states: indecency and naked. Indecency boosts your erotic by 10%.
14×110%=15.4 Rounded down to 15.
15×110%=17.5 Rounded up to 17.
So is how naked states negatively affect your body stats. If you have no states on you, your stats number will be equal on both sides. This has nothing to do with stats limitation.