Is it possible that you pulled up too hard on the first one? Also, have you done dry-burns and blow-outs? Generally speaking, once I've done the mod on a previously used atty, I clean it, blow it out and then do a dry burn and it is as good as new.
Id say its likely i pull too hard on all of them. Most (3 of 4) attys ive de-bridged i had to shove the ceramic unit back down into place.