This definitely applies to the NSpire Deux theme by Nick Cates (which I use on my site, www.wilsons.school) but I’m not sure how many other themes are affected. It’s a responsiveness issue because the site banner is displayed on iPhone X in landscape, which seems to be treated as ‘tablet’. It’s not just one page but every page in my site and also one other site I looked at that uses the same theme. It’s not just iOS Safari – I also tried Opera Mini and it’s the same.
I’ve contacted NC about it but he doesn’t have an iPhone X to test it. Is it a theme issue or a RW issue?