When browsing on si.com, right clicking on "open page in new tab" doesn't work -- it opens immediately on the same tab

When I am browsing on si.com, if I right click on a link within a story and select "open link in new tab," it opens immediately on the same tab I am on at that moment (as well as the second tab that I created through right-clicking). This does not happen with Firefox on any other site or when I browse si.com with Explorer/Edge...any thoughts?