Slideshow problem on inner pages

Helloo, There is problem with this theme, that when I add slideshow images on inner pages, on the first load, first picture wont load correctly, and then start working. I found a solution to the problem with adding additional css .backstretch {height: 512px!important}, but that resolve problem only on pc version, on mobile picture is still loading correctly. It would be nice if you have some suggestions about resolving this problem.

• This topic was modified 4 years, 8 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Developing with WordPress topic

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