Having imported these items, which were not recognized, I'm trying to create parent items manually. But, instead of the expected "Create Parent Item," the contextual menu only has "Change Parent Item." Yet, as you can see, they pretty obviously do not have parent items yet. What's up with this?
https://s3.amazonaws.com/zotero.org/images/forums/u2376597/pm6w7l70128es99b7ho1.png