Assuming you mean the Widget - This is caused by you somehow having an invalid achievement ID on your watchlist. Since you have some IDs still in your watchlist despite them all being unticked - It won't update the widget to go away since there's still 1 or more being watched.
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TODO:complete the list for accesskey usage different shortcuts on Windows, Mac, Linux .., currently shown for Firefox
Craftland
Assuming you mean the Widget - This is caused by you somehow having an invalid achievement ID on your watchlist. Since you have some IDs still in your watchlist despite them all being unticked - It won't update the widget to go away since there's still 1 or more being watched.