Hi there,
1. Is there a specific page where this issue is happening?
The home page seems to be fine to me:
https://www.screencast.com/t/SDqMvLXbPA
2. Can you try adding some mobile padding?
https://docs.generatepress.com/article/content-padding/
And make sure page builder container is not used as it removes all the default theme padding:
https://docs.generatepress.com/article/page-builder-container/
Also, looking at your layout, I believe you will greatly benefit from our new Generate Blocks plugin:
https://generateblocks.com/
It is built to create layouts like this and I think it will be really helpful to you.
It’s currently in beta but should be an official release soon.
Let me know if this helps 🙂