Karlshovud /Bårdsson of Kaupanger/ was a descendant of Karlshovud /of Husabø/
There seems to be about 3 intervening generations between Karshovud of Husabø (b. c1140) and Karlshovud Bårdsson of Kaupanger (b. 1280). The three men thus have been inserted - purely specualtion.
Karshovud of Husabø (b. c1140)
NN /Karshovudsson/ (b. c1175)
NN /Karshovud-grandson/ (b.1210)
Bård /Karshovud-great-grandson/ (b. 1245)
Karlshovud Bårdsson of Kaupanger (b. 1280)