Is it possible that someone else in your workflow uses an auxiliary dictionary?
You can check a referenced auxiliary dictionary by going to Utilities > Auxiliary Dictionary... There you should see a name and path to the dictionary.
If the path is accessible to you, such as a fileserver location, mounting that location will maintain the dictionary with the project. Or, if you just want it to go away, close the dictionary from this dialog by clicking the Close button.
Hope this helps.
Product Manager, QuarkXPress