No, everything is fine. Each Work Unit is identified using four numbers, in the format: Project(Run, Clone, Generation). Each WU gives us additional information about the dynamics of that protein, so it is important to us. We often need thousands of WUs per protein to fully understand its folding process. Unlike some other distributed computing projects, (SETI@home for example) our Work Units are processed to completion only once. It would therefore be extremely unusual to be reassigned the exact same WU.
