From which Kenites did Heber separate?

Judges 4:11 (ESV)

11 Now Heber the Kenite had separated from the Kenites, the descendants of Hobab the father-in-law of Moses, and had pitched his tent as far away as the oak in Zaanannim, which is near Kedesh.

Heber left the other Kenites who had settled in Judah (Judges 1:16) and allied with Jabin (Judges 1:17). Heber thus apostatized from Israel.1