I'm starting to see the first beetles pop out, but I noticed quite a lot (maybe a third) seem to have wrong looking wings/elytra (and/or trouble getting out of their old pupa skin).
Anyone knows what could be going on? Or maybe it's not really an issue?
I was thinking it could be that the air is too humid, but the only thing I put in the tray is (very little) oat bran.
(Additional question: what do you feed the adults, if anything?)