For iPad, The first time I focus on the drop down and click, it opens the list items and then automatically closes, next click it works and every click after that works. To reproduce, I can go to http://harvesthq.github.io/chosen/ and the first example has the issue when you select the drop down for the first time. Use chrome and open developer tools, click the phone icon and select iPad3/4 and refresh page, then select the first chosen example drop down, it closes the drop down on first selection during touchend. If I first focus on the element and then click or touch, then the problem does not occur. It seems like it has something to do with showing the drop down list and focusing on the element that causes it to collapse itself.