Search through API does not hide selected results when queried again

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1. Go to: http://semantic-ui.com/modules/dropdown.html#remote-content
2. Click on "Favorite Animals" dropdown.
3. Select "African Elephant" and "African Wild Dog". They will disappear from the dropdown options.
4. Click on dropdown box to begin typing. Search will initiate. "African Elephant" and "African Wild Dog" will reappear in the dropdown options.