Thanks for the reference, I'll fix it.
Change:
stat += level + status->agi + (bl->type == BL_MER ? 0 : bl->type == BL_PC ? status->luk / 5 : 0) + 100; //base level + ( every 1 agi = +1 flee ) + (every 5 luk = +1 flee) + 100
To:
stat += level + (floor(status->agi/10)) + (bl->type == BL_MER ? 0 : bl->type == BL_PC ? status->luk / 5 : 0) + 100; //base level + ( every 10 agi = +1 flee ) + (every 5 luk = +1 flee) + 100