Steve beat me.
It looks like the same issue as this.
Select one of the edges in the inner ‘loop’, and run this code to delete and recreate it.
mod = Sketchup.active_model
sel = mod.selection
ent = mod.entities
e = sel[0]
p1 = e.start.position.to_a
p2 = e.end.position.to_a
e.erase!
ent.add_line(p1,p2)