Issues with product pages after site update

I got about 50 messages this night “Your site has updated to WordPress 4.9.9”. And now I’m checking all my pages, on products pages, something changed.

Ex.:

https://rat+++++.de/product/willkommen-mein-babygaestebuch/

I do have a staging site for testing

http://rat+++++.xn--broblanko-q9a.de/product/babywiege-schlummerschoen/

You can see the product page has a gallery, but on the live site, all the images are below each other.

Can you help me?