Text disappear while browsing results

[therealsamsquanch]

Mention someone (Person-A); Write some text; Start to mention another person (Person-B);

While looping the list with the keyboard arrows or the mouse, the text in the textarea will disappear, but only the text until the previous mentioned name, (Person-A).

Could reproduce the error in the demo fiddle (http://jsfiddle.net/vq6MH/66/), using Firefox (latest) and Chrome (latest).