Hello @Magnat,
I have deactivated the lightspeed cache plugin on your site and then tested your site on my personal mobile phone and laptop. The results indicate that the site is functioning properly. I have also captured a video of the mobile view for your reference.
Mobile view in Customizer: https://postimg.cc/hXn8X99s
Mobile video: https://www.veed.io/view/d3a42236-fd1d-4ed5-942e-7be368935074?sharingWidget=true&panel=share
Laptop view in Customizer: https://postimg.cc/0KdQFJb5
Laptop screenshot: https://postimg.cc/XG6BPWQ8
We recommend that you clear your browser cache and check your site again.
Best Regards,
8Theme’s Team