Actually, I think what is happening may be more akin to why you do not pop baby chondros. These guys have really fragile bones. I knew this and I have been extremely careful when feeding/handling them. I do not know how the seller was handling them though and if he was not as aware of the fragile nature of their bones it would be easy to overlook the fact that you can not "clamp down" on them to keep them still while tubing. I think they may have sustained damage early on and it is only now becoming apparent.
That is not my pic. It is a screen shot from another forum. I captured it for a "bad person" thread on another site. I can provide further details via PM if you like.I'm curious about the other picture in your photobucket. It looks like a frog and a BP? What is going on in that picture??