On second thought and "look", I think hinge is much too harsh a word for your upper limb tiller. Bending a little too much is a more proper evaluation.
I had a similar situation on a BBO I made a few months ago. I strung the bow for the first time, noticed a hingy place out of the fade. I should have immediately unstrung the bow but left it strung for a while. By the time I unstrung the bow I knew I had goofed up. My 60# bow became a 45# bow while working out the hinge a i didn't have it completely corrected. Off to the failure pile it went.
Not one to be defeated, I pulled the bow out of the failure pile a a week ago, cut all the osage off the belly except an 1/8" strip, glued a new piece of osage on and started over.