You shouldn't have gotten 6000 points for 2 handed sword.
You started a fight with 1 arma using 2 handed sword (lvl 176), the fight keep going and you used 1 handed axe (lvl 231) in order to kill a gubani.
At this point, the fight is agains 1 arma and 1 gubani with highest lvl skill used being 231.
You kill the gubani, but the fight is still on-going agains 1 arma, highest skill use in the fight is still 231 (still the same fight you are involved in).
You kill the arma and get the xp (based on the highest skill use in the fight (231)). Fight ending.
You started a fight with 1 arma using 2 handed sword (lvl 176), the fight keep going and you used 1 handed axe (lvl 231) in order to kill a gubani.
At this point, the fight is agains 1 arma and 1 gubani with highest lvl skill used being 231.
You kill the gubani, but the fight is still on-going agains 1 arma, highest skill use in the fight is still 231 (still the same fight you are involved in).
You kill the arma and get the xp (based on the highest skill use in the fight (231)). Fight ending.