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Store Pages are used for Tagalong as it allows Tagalong to use the built-in WordPress mechanism for recording and storing taxonomy data on a per-location basis. They are kept in draft mode and “hidden” until/unless you use the Store Pages add-on pack.
Update your locations via phpMyAdmin and set the sl_linked_postid back to null.
Installing/activating Store Pages MAY allow you to re-created the pages and reset sl_linked_postid, but I’ve never done it outside of the application and I’m not sure what the call order sequence is for Tagalong fields v. Store Pages.