We can move misplaced pages between sites without leaving a confusing trail of forks by moving the files within the Dot Wiki directories.
Login and change directory to the desired site's pages subdirectory.
cd .wiki/bar.wiki.org/pages
Check that the page in question is in fact not there.
less wanted-page
Move the page and coax wiki to rebuild the sitemaps of both sites.
mv ../../wrong-site/pages/wanted-page . rm ../../wrong-site/state/sitemap.json rm ../state/sitemap.json
See Delete Pages for related technique.