The search result popover may be passing above the header.
Ppopovers have the same z-index as the header, so their positions in the DOM makes them above the header.
We could set a higher z-index for the header but the network switcher dropdown menu (using a popover) becomes underneath the header and apparently can't change it's z-index (can for the content but not its container which is what matters). This is the way to explore though.
The search result popover may be passing above the header.
Ppopovers have the same z-index as the header, so their positions in the DOM makes them above the header.
We could set a higher z-index for the header but the network switcher dropdown menu (using a popover) becomes underneath the header and apparently can't change it's z-index (can for the content but not its container which is what matters). This is the way to explore though.