Why are various workunits still "pending" although at least 3 successful calculations occurred and the results were returned?

A list of the workunits (with claimed credit) concerning me is in an enclosed way:

workunit ID / claimed credit

2281308 / 30,95
2189644 / 25,92
2090827 / 32,95
1666345 / 36,11
1233973 / 27,75
1003565 / 36,09
168876 / 37,08
122906 / 35,75
390963 / 36,19
157763 / 0,46
973860 / 28,88
973445 / 28,22
904838 / 36,28
577395 / 28,79

Sum 421,42

Many thanks and many greetings

workunit ID/claimed credit

3758515 40.81
3734396 68.40
1493039 41.52 (August unit)
1493038 38.19 (August unit)
406629 57.99 (July unit)
407179 41.30 (July unit)
300933 0.47 (August unit)
302011 53.58 (August unit)

Why these units which were successfully returned in July and August have not yet be credited? This has kept me wondering for a few months now...

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WinXP Home, P4 3.2GHz HT, 512Mb RAM. Running SETI, Predictor, Prime Grid, SIMAP, Folding