The list of quick links in the header nabber has an additional line separator at the bottom of the list on desktop viewports but when scaled down to mobile, this line is correctly adjusted and 'technically' not there.
It seems as though it's there to ensure that on mobile when the FAQ link is displayed there (rather than outside the menu while on desktop) it fits uniformly with the other links in the quick links menu.
It's a quick and easy template change to remove it.