Static Ground is a node in Static Orb, which will leave a DOT on the point of the explosion. It seems to be affected by all nodes relating to Static Orb’s damage.
Enter “Biting Force” - if taken convert Static Orb to cold the animation of the dot on the ground changes to cold swirl as well, which make us assume that the skill is converted to cold. Unfortunately the skill tool tip visible from pressing ALT still has the lightning tag.
It’s hard to tell if its only a tooltip bug or a functional bug.