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Well, I think it's just a mangling of japanese chars trying to fit into the extended ASCII space.
Did you look at the example image?
On that same note, is there anything in XOOPS that would cache-and-serve old versions of a page, or is it my webserver. I've noticed that some of the changes I make take some time to take effect, and my not-at-all-stable install of Apache may be to blame.