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Your source says you are using the wow2 theme? Is that 100% compatible with Xoops, or just phpnuke?
I ask because I have crusade_k as one of my reference themes, and the layout looks similar to your site. Crusade_k displays all correctly on my site, but I don't know how telling that is since I don't know what the differences are between it and your theme.
Where did you get your theme? Maybe I can install it and see if I have the same problem.
I don't know.