Slider does not shrink

Hi,
I’m using your theme and my problem is the slider on the startpage of my website. Because of this issue I had deleted the slider and create a testpage with the slider. Please see the URL of this page in the private content-area.
It seems, that the calculation of the size of slider not work correctely. Sometimes the slider will stop at the calculation of height of itself. Then the background-image will fill the space of all slide-images on the top of each other. There is no functionality on the slider and the slider-images will not be visible.
But if I go to the backend in the enfold-child-theme-options and change a style in the styling-settings, then I save this and the Slider will be work correct.
Best regards
Dirk