Problems on Apple Safari

We use the theme for our festival RockDenDom http://www.rock-den-dom.de . Recently, we have problems with the display on Apple Safari . Here, the page does not load correctly . There seem to be problems in CSS . Have else this problem ? Thanks for the help in advance. Dominik

Hi,

I can't see this problem on the default version of the Fest theme, you have some errors connected with Stray end tag section and Unclosed element div, please check your website here: https://validator.w3.org/
Fix these errors and check the Safari browser again.