Trying to loft a boat hull

Having an issue with lofting a boat hull. I saw a youtube video doing it the same way and it worked flawlessly for him (as always!) but I can't get it to work for me. I've attached a screenshot showing the frames geometry and lofting guide curves. How come it won't fill in at the bow or stern and stops at the last frame geometry provided and doesn't fill into the guide curve?

Thanks!

SolidworksSurfacing