No matter if my armor or weapons are at level 14 or 50, the spiritbond will not increase beyond the level shown in the image. I've tried everything I can think of. I've killed super low enemies and high rank ones. I even bought the Patriot's Choker and that doesn't even help.

https://i.minus.com/icCfwkB9BEBak.png

Currently I've tried increasing my spiritbond on my level 50 Marauder and level 50 Archer.