Thanks for sharing the journal and powerpoint. That helps a lot.
I see what's going on now. It looks like you're using Graph Builder with a column in the Page role and the Save to PowerPoint isn't considering each of those as a new graph. I think it should. I'll let our development team know and we'll see if we can address it in a future release.
Unfortunately, I don't have a good workaround at the moment but I'll keep looking at it to see if I can come up with one.
-Jeff