If you activate page /a/A (uuid=1) to a public instance where a page /b/B exists (uuid=1) the page is imported to /b/A
You can run into this situation if you move/rename a page while the public instance is not reachable. As the page still exists in the same place in the public instance following activations will publish to the old place.
- delete the old page in the public instance
- to find the old page (with the same uuid) execute a jcr query (Tools / JRC Queries): select * from nt:base where jcr:uuid='the-uuid'