The attitude in front of Personality section meant to be a character's worldview/perception (optimist(ic), pessimist(ic), realist(ic) etc etc)

The one in the combat section meant to represent character's attitude towards combat and fighting based on the things that are important for them (for example, character with merciful attitude is not cruel, might not attack first and will always spare the enemy if they no longer want to fight. Character with merciless attitude might fight fiercely and won't spare the enemy who attacked them first. Character with guilty attitude might feel bad from fighting others in any way, while character with indifferent/cold attitude won't care and won't show much mercy, although also won't show strong cruelty. But that's just my personal take on those! These can mean different things based on your own thoughts and preferences!