When using the slideshow sidecars and attempting to use nav links there seems to be a bug. If the slides in a sidecar exceed the height of the initial slide, then the nav links will not open to the the header, instead they will open to a second slide where the linked header should appear. This is difficult to explain, but screenshots below.
Each sidecar initial view uses a top level header to create a link (image 1). In my case, the second slide of the sidecars is longer. When clicking the second link in the nav header, it opens the second slide in the the series at the point where the second nav header should appear.
This is only with slideshow sidecar and is repeatable with all browsers.