Looks like your clones have run out of water. Probably because they stopped trying to live quite awhile ago. Did you use a rooting hormone? Was the host mother healthy and in a vegitation cycle? If both are not correct then they are your problem. If not, the other reasons your previous clones died of could be an indication of contaminated soil, or just poor growing conditions. Can you post a few more enovironmental factors? Maybe post what equipment (other than are in the picture) you are using? Just some thoughts...