Hmm. Ive never done them like that. Ive always sealed and glued the images inside the bezel, then poured the resin.
Im suspect of two things:
1. Could it be possible that the e-6000 isnt covering the entire back of the photo casting before you glue it down?
2. Are you pulling away extra E-6000 once its cured? I will pull or trim away extra E-6000 after it has cured. Sometimes when I pull it away, it will pull some of the extra from underneath what Im trying to glue. (I use it to glue bails on pendants).