I saw that you are using Bootstrap 2.2.0, there was a known bug (https://github.com/twitter/bootstrap/issues/4550) that could be potential problem. It was fixed before the 2.2.2 release, so upgrading to 2.2.2 could solve this problem.
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I have the same problem with Ipad 2 iOS 5.1.1 with Safari. The filter drop-downs on explore listing have the following problem: * Some of them doesn't respond when clicking on them * The ones that respond can't be scrolled * Items in the drop down can't be clicked. When clicked, the drop-down disappears and the item behind the drop-down is clicked (usually a picture of an article). This basically renders the filtering functionality and all other drop-down functionality useless.
What is the actual problem? Is it drop-down menus (a problem reported elsewhere)?