Tim: I'm happy to say by now that the problem is now resolved.
I was using an obsolete version of Firefox. Way obsolete. Like--Version 3.6 instead of the Version 16-plus that's out now.
When I upgraded to a new operating system (had to do a "clean install" to do it properly), I got a far more current "build" of Firefox. And it put the Stats graph into the right place.
I'd been having several browser issues, including the visual editor not wanting to load. I had a friend who had the same problem. But she also was using a long-out-of-date OS, and probably the browser, too.
I not only installed current versions of OS and browser, but also changed architectures, from i686 to x86_64. I played a hunch, and it paid off.