We have recently run into a issue on several of our applications. When a button is clicked on a mobile device or emulated on the chrome browser (for testing and developing) that is next to a non button component, both are registering the click.

Here is a fiddle that can reproduce the issue if you click near the bottom of the button you will see the button is clicked and the textfield receives focus: https://fiddle.sencha.com/#view/editor&fiddle/235g

I know this could be seen as bad design in my example, but we have seen this exact issue with some space between a button and a textfield on a form. We have also seen it on devices when a button click causes a floating a panel to show with an animation and mask. The mask click is set to hide the panel and any over clicking or 'fat fingering' of the button causes both the show and hide to happen.