I dont like this orc… he schould stick with his girlfriend, please make the orc disappear or sth

This doesn‘t add up i guess? If he needed 400 points to reach lvl 2 and from the logic it means he needed 800 points to reach lvl 3 wich he got from this one mission. Then he is like something over 1000 exp into the 4th level, but he got 2400 exp from the other mission (defeat 8 guys at once or something) even if you take the 100 exp for healing his almost blown up head, he schould be at least lvl 4 with maybe two-thirds to got to lvl 5… sorry if I am understanding smth wrong here <3