Can't create mobile header

I am new to this theme and the builder. I have my site set up pretty well but I noticed that when I access the home page on an iPhone the default header from the template shows up. On all o the other pages my own header shows up. I can’t figure out where to set the mobile header for the front page. If I use the header manager in the builder it shows the page correctly, but on the phone it always shows the default header. I’ve used both chrome and safari and cleared the cache.