Lazyload not working in Safari

Hi, pretty sure it isn’t the fault of this plugin, but would like to ask for your opinion regardless.

Try clicking any of the image banner in the homepage and the post will show up in wp-post-modal. Scroll down to the bottom and there will be four lazy-loading images.
The problem is if users are using Safari instead of Chrome, these four images won’t load in Safari.
However, if we access the page directly instead of through wp-post-modal, the images will render correctly.
For example, the first banner won’t load the bottom images if it is rendered in wp-post-modal but they are fine if the post was access directly (via url).

Do note that Chrome doesn’t have any of the problem mentioned above.
Also, all the images work fine if I turn off lazyloading.

What do you think is the cause? Thanks for your time.

The page I need help with: [log in to see the link]