I haven't messed up a bow in a long time but it happens.
I had a hinged hickory bow that a student got too agressive with while tillering, it sat in the corner for months. A couple of days ago I heat treated the belly, brought the limbs back into line and started tillering the bow, I was hoping for a very light weight ladies bow.
To me hickory is just OK, makes a decent bow but it isn't osage. As I progressed on the tillering and had almost everything in line something would change. I would exercise the limbs between scraping, get a modest change and continue scraping then it happened, a hinge, then another. It was like all the exercising was for naught and when the bow decided to register a change it did it all at once.
I was way past a light ladies bow at this point and might have been able to salvage a kiddie bow as best so I decided to feed my BBQ grill with what was left, hickory makes some nice smoke.