While scrolling no click is possible on input field


I have an input field on top of a list like this http://codepen.io/brandyshea/pen/gbZrNQ. I don’t understand why I can’t click into the input field while the list is scrolling. On desktop with a mouse click it works but on the iPhone 6 (Safari) it doesn’t. Is it an ionic default behaviour? Is there a way to achieve that the click will be handled always?

I’ve googled around but can’t find a solution.

Thank you and Regards,