tawabi HI. I'm so sorry. I'm unsubscribed from this thread accidently and now just found it again. Since I was not able to reproduce it with iPhone4s, Samsung Galaxy and my wife's Lenovo I'm not sure how to proceed in this case.
Please try and switch template to Protostar, which is a joomla default template and make this test again. This will help determine if problem is coming from template or from browser itself.