Question about StarGladiator Damage

[kyoshiro421]

I have tested my Star Gladiator's damage with his bare fist and with an ordinary book on a vanberk and it seems that the damage with bare fists is stronger than the damage with a book. I had no other buffs (except for agi and bless) and no element. Is this supposed to be like this or is something wrong with the damage output? :/