Click works in mobile preview but not on touchscreen or phone

I have determined the problem and fixed it, but I still don't understand why that's the case.

My user click event in my Slide Master brings up a new layer, also in the Slide Master. This new layer is not a dialog, yet it doesn't cover the entire base layer either. In this new layer I had a trigger which hides the layer whenever the user clicks outside a rectangle on the layer. This is what was causing the problem. All I can guess is that a tap from a phone or touchscreen causes the hide layer event to fire as if it was detecting someone clicking outside the rectangle, so it was being interpreted that the user was both clicking to show the layer AND clicking outside the rectangle to also hide the layer. I changed the logic slightly allowing me to remove the "clicks outside" trigger, and the problem went away.