CPU seconds don't seem to match Credit Claimed.

My question references this URL:
http://einsteinathome.org/workunit/5061278

My computer 523564 typically claims the lowest credit (by over 50%) in the quorum but usually does not have the lowest CPU seconds. In this work unit, everyone is running a 2.8G processor, mine on Linux 2.4, another on Win2000, and the other on XP-SP2. This occurs over and over again. Any idea why?

BTW, when the min. quorum was 4, my strategy was to be the last one to post results. This usually boosted my granted credit as my requested credit was usually the lowest. Now that the min. is 3, I can report any time without changing the granted credit, so I've reduce my work queue to one day.

dag