I could have evacuated the bowl but not gone all the way down the bend and into the drain line. Sometimes, if it just barely swallows it out of the bowl, it doesn't mean that it's gone all the way down. So...you may want to make sure it wasn't clogged a little further down by giving it a second flush. As a user of that brand, I now have a good sense of when, although the bowl looks clear, a second flush might be helpful. Then I hear a giant glug, glug, glug from the shower as the mass of stuff drops two stories into the basement and I know that the second flush was worthwhile. Doesn't happen often, but it is necessary once in a while.
Seriously -- you intentionally tried to clog it, failed, and then are surprised that there might be some residual there on the next flush? That Charmin is NEVER going to dissolve (at least not this year), unlike other toilet paper, so, unlike other toilet paper, you can't just wait for it to "clear itself". That's not unusual for other paper, but it won't work with the Charmin.