Hi,
This is related to the WYSIWIG editor. If you attempt to insert a macro, and then you view
the page. The contents from the WebHome page if it exists for that space are also merged
and displayed, even though if you view the wiki code, it only has the original wiki text
in it.
See the following link for an example:
http://sandbox.xwiki.org/xwiki/bin/view/Sandbox/InsertMacro
Thanks,
- Ibrahim.