Cannot place image in mobile Grid & Jpgs dont show on mobile

[RR]

hi - I have issuse with placing images on the mobile version.
I can place jpgs inside the grid - but they dont show up in Chrome/Safari.
So I tried SVGs - which first worked but now I cannot place the images (SVG images) inside the grid anymore!

Bildschirmfoto 2022-05-09 um 11.12.35.png

Link to the page:
electric-climbing.at

I would be super happy to get some help for this.

Cheers!