stopped working on my site

Hi, I am using the drob shadow boxes on my site https://www.wushantcm.com
Right now the functions location at centre plus the shadows are no longer shown on my website. Neither using the shortcode.
Before it worked so it might be related with the newset wp version?!
But on other hand on my webssite https://www.wushantcm.de the boxes do work fine, here use the same version of WordPress.
Kindly ask for help. Thank you
Tim Vukan

https://www.ads-software.com/plugins/drop-shadow-boxes/