Hi Juliusable,
thanks for using MH Magazine lite.
The excerpts (and some other things) are not being displayed on smartphones to avoid unnecessary scrolling, this is part of the theme design and is supposed to work like that.
Most users have crowded magazine-like front pages with lots of content, see theme demos, and that’s why it is important to have a compact overview on mobile so that visitors can quickly check for new content (without scrolling much) and then read what they like.
However, if you’re familiar with coding and want to change the layout for your website, then you could create a child theme and customize the theme based on your personal requirements.