My calculator says his salary should be $ 3 664, however, if you replace JS from respectable(7) to strong(8), his salary would be $ 4 311.
I would suspect his actual JS is something like 7.9. And probably his RB>6, JR>5. OD>4 and ID>5.
If you give him 7.9 JS, 6.9 RB, 5.9 JR, 4.9 OD and 5.9 ID, his salary would be $ 5 478.
It could be anything from his JS being very close to 8, to all of his "salary skills" being about 0.4 higher than what it says.
"Air is beautiful, yet you cannot see it. It's soft, yet you cannot touch it. Air is a little like my brain." - Jean-Claude Van Damme