Lightbox images not converting to WebP

Hi, please help.

All my project images are jpg. In my project there are couple of lightboxs for gallery. When I export my project all my images have a WebP alternative , with exception of lightbox images, they stay jpg only. This slows down the loading. Is this normal and if yes, what is the solution to slow loading?

Maybe you can share a URL to your website.

yes sure, Muscat City Excursion