Yes, that is some pretty bad hinging. You need to solve that if you don't want the bow to become kindling. Solving those hinges probably means you will come in grossly underweight. It's common for a first bow to come in very light. Don't worry about that - learn while you can, so the next bow will be much better.
You need to remove wood from the inner (closest to the handle) half of each limb. First, put a clear X-mark on the hinges, as to not touch those again. Then scrape wood from the inner half of both limbs, and check tiller again, using the tillering gizmo. It's a pity you haven't used that tillering gizmo earlier on in the process...that would have saved you some poundage... Remove wood from where the tillering gizmo tells you to remove wood. Check tiller again and repeat.
If the bow is made from a stave, it's very difficult to back it with wood since the back of the bow is not flat enough to just glue down a backing. You
could back it with rawhide, linen of flax, but that will only only a few pounds. My advice: fix tiller on this bow, see whatever poundage you end up with, and start with your second bow!
By the way, you could try a rawhide or flax
patch on the back of the bow at those two hinges, to stiffen them up a bit.
