Sorry to resurrect an old thread, but there was an infuriating bug in Safari where it would often jump to another open tab for no apparent reason. I especially found this troubling when ESPN was open, but not the tab I was viewing. I think it happened when ESPN refreshed, but I'm not sure. I found a workaround by using Little Snitch to prevent ESPN.com from communicating with GO.com, but this really greatly reduce the functionality of ESPN.
The new release version of MacOS 15.3 has fixed this problem. For a few days, I've unblocked Go.com in Little Snitch and there has been no jumping to the ESPN tab. Not even once. Finally, a bug got fixed. A bug. Just one, but one I really hated.