Fix responsive site for view on iphone / Apple

have a responsive web site that is a few years old and the menu is not showing properly on apple mobile / iphone. It is showing fine on android / samsung products. Web site is https://www.pathwayscounselingcenter.org/
Looking for someone to fix menu on site so that will be viewed properly on apple mobile products / iphones.
The menu for small should be vertical and it is showing horizontal on the iphones.

Site is built on ASP Classic - VB