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.
Check that the page in question is in fact not there.
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.