Loretta, that will be my extension* giving you the relationship on the profile page. Glad you like it. (Notice that this is only for ancestors. I would like to put all relationships up there - '4th cousin three times removed' and all that, but at the moment, it's not really possible.)
But yes, your 7th GGF can also be your 8th GGF. Click the buttons (the green things that say 'Your G7GF' and 'Your G8GF') and you'll see the lines of descent. You can see the same in Chase's Ancestor Explorer. You may have many lines to one ancestor each with different genetic distances. I've seen results giving 18th GGF and 28th GGF for the same person. If your lines go very far back, take a look at Ancestor Explorer - it shows how many lines you have to each person. If you find some with about 15 lines or so (or even 5), take a look at the lines, and you'll often see that they're of different lengths.
* I uploaded another update just before which will make this a little better. At the moment, if there are many lines, it can take quite a while to 'build' them and there's no kind of progress bar. The update will show 'Building 1 line: 3 generations' ... 'Building 4 lines: 8 generations'... etc. as it progresses. It's not perfect yet - I saw one result which gave 410 lines(!) from a WikiTreer to a medieval Scottish king in Ancestor Explorer, but my extension was showing only 351 buttons (with 351 lines of descent). The extension defaults to showing 4 buttons with a 'Show more lines' button to see the rest of the lines so your screen isn't filled with buttons (until you click the button). You can change this default in the settings (after you get the update).