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Yeah that's what I just noticed in your website, my posts there are -7!
HAve you tried reseting the templates? I got the same problem when I tried to upgrade from newbb 2 to cbb .
also there is another way to reset synchorize all the users.To do this, I think there is a feature in the core to SYNC one user, now if you change the files that synch function is defined there,and change the user argument to "all" it may work. I do not know that with 2.2.3 but it used to work with XOOPS 2.0.7.3.
Anyway Just try to find the user SYNC function and change it to all.
My Persian Xoops Project:
http://www.MPXP.org