author set to admin in sub blogs - i.e. wrong author is attributed

Hi all
can you help
I have a wpmu install ( http://learningprofessionals.co.uk ) and in sum of the sub blogs each time a post is made the author is listed as the author from the admin field, rather than the local admin

anyone come across this before?
it does not happen on all blogs, but most - I cannot find what is doing it.

thanks in advanced

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