Im not sure what cause it ive read from genetics, feed to humidity to temp,all the things everone else has said.
I do know that you can fix them.I used a similiar method as the one described above.I took a piece of regular scotch tape and lay there foot out it nice and even like its supose to be.Then go over the top again with another piece or else it will just come off in a hour or so.So basically there foot is sanwhiched between two pieces of tape.I trimmed up the edges a little bit but not inbetween the toes and then added a litle piece of sandpaper to the bottom so it wouldnt get bow legged.They have sanpaper that is sticky on one side you can get it at wallmart in the automotive section.
This works Ive done it several times.You leave it on for a couple days and they will be fine.
Hope this hellped
good luck.
I do know that you can fix them.I used a similiar method as the one described above.I took a piece of regular scotch tape and lay there foot out it nice and even like its supose to be.Then go over the top again with another piece or else it will just come off in a hour or so.So basically there foot is sanwhiched between two pieces of tape.I trimmed up the edges a little bit but not inbetween the toes and then added a litle piece of sandpaper to the bottom so it wouldnt get bow legged.They have sanpaper that is sticky on one side you can get it at wallmart in the automotive section.
This works Ive done it several times.You leave it on for a couple days and they will be fine.
Hope this hellped
good luck.