Image Gallery Navigation Issue

In the image gallery, since version 2.2.8, the buttons for back, forward, zoom, full screen, and close are displaying incorrectly.

You can see it in the picture here:

https://new.galerie09.cz/wp-content/uploads/2024/10/22.jpg

or on the page here: https://new.galerie09.cz/umelecke-dilo/alena-antonova-akt-s-kvetem-ii-drevorez-a-akvarel-original-grafika/

Here is a picture of the correct display, version 2.2.7:

https://new.galerie09.cz/wp-content/uploads/2024/10/11.jpg

Can you help?

Thank you!

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