Druid spell bar slots empty

When my druid is in town, it’s spell bar is populated as intended. When zoning into a combat area, one or two slots appear empty and are non-functional.
Hitting S shows the correct spell bar, but after the first click on a skill the slot is empty again.
Edit: All non-bear skills get removed from the spell bar as soon as I switch into bear form - tried removing aspects, switch out gear, so far no change.
Edit II: It’s not a bug, it’s a “feature” of running grizzly rage permanently.