wp-admin-canonical is broken, as it assumes how WordPress is installed.
there was a plugin to fix it, but the plugin was removed from the plugin repository apparently. It is still on github and pluginmirror though:
https://github.com/wp-plugins/remove-wp-canonical-url-admin-hack
http://www.pluginmirror.com/plugins/remove-wp-canonical-url-admin-hack/
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