Hi,
On your listings, you have a hover effect added by the template so that it displays the button to access the category when you pass the mouse over the area. On mobile since you don't have a mouse, you can't do that. It seems that the template has some special code to make the area clickable on mobile devices so that the problem is circumvented. But apparently, that doesn't work on iphone as I was able to reproduce on my end too.
Unfortunately, that's something coming from the template, so you'll have to check with the template support what they recommend to fix that.