Elementor Update changed images unclear

Hi, since I’ve updated Elementor, all of the images cannot be shown or shown clearly, like low opacity images.

I tried:

– re-install former version(3.0.7), safe-mode, re-generate css, Sync Library,
– I deactivate non-essential plugins, but the result is same.
– Off my server’s speed up services (like caches)

Those trial were unsuccessful and
I deactivate Elementor, the images are OK.

At the homepage, the top slider has a background image behind the text, but it doesn’t show.
In editing mode, the image are seen;
https://japan.musicolive.com/index-editing.JPG

But please visit other pages, this page would help you understand easier to my issue
https://japan.musicolive.com/meet-our-producer/

I use the theme of this (https://mayo.teconcetheme.com/musicum/) And Easy Digital Download feature images are OK.

Thank you for advance,

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