Bad luck. I think you used a unappropriate glue or the surfaces where not prepared in a proper way - or there was a wrong mixture of glue (if epoxy was used)
I would reglue (after removing the old glue and cleanuing with acetone) with epoxy and after fully cured I would wrap the fadeouts with some sinew, soacked in hide glue.
But do not use screws - there is good chance to violate the back of the bow and, beside the screws, you have to apply glue anyway as you can not screw down the very end of the fade outs.