While the best would to have had the spar sitting in the "bottom" of the notch in each rib, it's not going to be a big deal if not. You would probably cause more damage by trying to remove the spar than if you just left it. Since you're using CA for your build, run a bead of thick CA where the spar and rib meet. Or even a small bead of 5 minute epoxy will do better. Just get something there to stabalize the spar and rib. You'll be ok. Chock it up as a learning experience

Ken