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lol I found out how to do it!
When i post an article in my website i use Dreamweaver and paste the code in the "compact" editor included with Xoops.
For some reason the editor automatically inserts a
in place of the end of line character that Dreamweaver puts
So the result is a double spaced
block
Solved! Remove the end of line Character! I guess i shouldn't have posted but then again someone else might get in the same situation as i did.