Jumping fixed widget

Hi there,

I got the problem thast my fixed widget is jumping to the other side. I have found this thread https://ww.wp.xz.cn/support/topic/sidebar-widget-jumps-to-the-right-on-chrome-and-safari

but I dont know what exactly is to do or which file have to be edited. I use a free child theme from the cherry framework http://www.templatemonster.com/free-wordpress-business-theme.html

about your help I will be very glad

https://ww.wp.xz.cn/plugins/q2w3-fixed-widget/