The selection in the dropdown field remain highlighted

2. Drop down menu (below the radio button as uploaded), when I select the option, the list does not disappear and the option i choose remain highlighted but it seems nothing has happened and the system does not recognize I select a choice.

I'm sorry, but I'm not sure if I understand this issue. Multi-selection is allowed in the dropdown field, I see nothing wrong with it. The selected option will be highlighted since multi-selection is enabled. That's how it works. 

If you can provide us an additional information about the problem, that would be helpful.