Adobe Lightroom Classic web gallery does not display all thumbnails on mobile

Hi I'm using the html/css/js tool from Adobe Lightroom Classic to generate code for web photo galleries. This is working on desktop, but on mobile I only have the first 5 images and I don't know why. In DevTools all images are loaded and displayed…

Would anyone have identified and fixed this issue ? Could be in main.js file or in main.css file I suppose.

Also posted this on Stackoverflow, here. (But could only paste the main.js file there, with main.js and main.css I reached the size limit…)