I take pictures with one limb up then I flip it to see how it looks, the upper limb that looks as though it is hinged is the lower limb in the second pic, and it does not look hinged. I think it may be a slight optical illusion because the back of the bow has a lot of contour to it, it is not flat from side to side or from the handle to the tip, it is very contoured. With that limb on the bottom I have a 1/8" positive tiller.
I will put it back on the tiller tree and take another look, and will try and get the tips bending a little more. This bow is for a tree size guy with long arms.