Hello,
I have checked your site, and it looks like the issue was caused by the Lazy Load Media option enabled in the Speed Optimizer plugin > Media settings and Theme Settings > Performance > Lazy Loading.
Navigate to Speed Optimizer > Media
Disable the Lazy Load Media option
Save the changes and clear your cache
If you still want to use lazy loading for performance optimization, you may try enabling it only from one source (either the theme settings or a separate optimization plugin) to avoid conflicts.
Best Regards,