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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.