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I use Chosen for a vocabulary of music genres. Several genres have multiple parent genres.
Terms that have two parents appear two times when added to the Chosen-box, and if using ajax, it's not possible to delete them. I guess it's because it tries to delete one of them, and then on page reload discovers the other one, and then adds both again.
Also, for some terms - i'm not sure why - i simply cant delete dem. When hitting the X-button on the term, the term dissappears, but when the page reloads, it appears in the box again.
There must be some depth-bug somewhere. The "reduce duplicates"-function in Views does not change anything.
I hope this makes sense. :)