Filtered entry won't be sent, removed

[zedr]

On http://quasipartikel.at/multiselect_next/

On Chrome, try adding a couple of entries directly from the sidebar. Then filter the sidebar list down to one entry and add it. Submit the form. Only two values will be sent. The third entry also cannot be removed form the list.

Happens on Chrome 13.0.782.220 m. Not replicated on Firefox 5.0.