Hello,
When resizing a browser (any of them) with the sticky header setting enabled there is a near seizure inducing screen shake. Sometimes, when the issue is occuring it also prevents the browser from scrolling. Note, this does not appear to occur with pre-defined headers.
I am using a custom header with the "sticky-header" settings enabled in template config. There's no other customization to JS files on our part. We use custom header as the pre-defined offer no options to resize grids for responsive.
I've added a link to a video in the hidden content.