I have exactly the same issue. It's like it has the old data cached. I've even deleted the collection in the CF Admin and rebuilt it.
I normally rename the collection and rebuild it but I just found in the CF Admin that you can Purge the collection. That seems like it would fix the issue too.
Index | Analyzes the files in a collection and assembles metadata and pointers to the files. |
Optimize | Reclaims space left by deleted and changed files by consolidating collection indexes for faster searching. You should optimize collections regularly. |
Purge | Deletes all documents in a collection, but not the collection itself. Leaves the collection directory structure intact. |
Delete | Deletes a collection |