According to the Quiz List page I've claimed 1001 lists which means I should be at tier 6. However it looks like I've only gotten credit for 982 on the challenge page

Although not at the same degree I too have a discrepancy between the two pages. I go by the amount shown on my profile and ignore the other number.

By the way, well done, I’m only at the 350 mark so far, so a long way to go to catch you.

We've done some testing and the theory is that some lists may have been deleted, causing them to have fallen off the count. They'd still be on the count of the list page (you claimed them at some point) but no longer in your list.

The lower number is the official one however, you'll need another 18...

Hope that's the end of the deletions!

An author can delete a list for any reasons. It doesn't seem to be a common occurrence - 20 out of 1000 is just 2% - but it happens. Maybe someone posted a list only to later see it practically identical to another one or hoped to include more material that never came.

If you play new lists early, you're probably running a higher risk of seeing one deleted after you play it; I would assume that the most deletions happen early, if a list creator finds it just doesn't work as intended.

My experience has been that all the quizzes in my quiz lists have tumbled drastically down the rankings. People picking off lists to win badges and upgrades are, I imagine, playing quizzes they aren't particularly interested in and don't appreciate. If you are concerned about your quiz ratings, that would be an incentive to delete your lists.

When a player becomes inactive are his/her quiz lists removed?

No.

To WesleyCrusher and Upstart3's posts above:

I can think of a reason a quiz list compiler might want to delete a list, and it isn't concern over falling ratings of the quizzes contained therein. I recognize that most quiz lists contain quizzes written by the compiler of the quiz list, but that is not necessarily the case. Gold Members may compile quiz lists that contain quizzes they have not themselves written. I will use myself as an example. I have written 0 quizzes, but I have two quiz lists. Obviously, the quizzes in my two quiz lists were not written by me. I have no idea what has happened to the ratings of the quizzes in my two quiz lists since I created them. I picked easy quizzes for the most part at the time. When I created them, my thinking was: "How can I design these so that people will want to play them?" I wanted them to have exactly 5 quizzes each, because 5 is the minimum needed for being able to get credit for claiming them, and the longer the quiz list is, the less likely I felt that people would want to play it. Also, the quizzes I included were as easy as possible for the theme that matched the titles of my two lists. I felt people would be more likely to play quiz lists of easier quizzes than more difficult ones. But since none of the quizzes in my quiz lists are my own, this did create a worry for me:

What if someday for some reason one of the quizzes in my quiz lists were pulled offline for some reason unknown to me (as I'm not the author)? If that happened, it would be impossible to complete the quiz list while said quiz was offline. Yes, I could delete the offending quiz and replace it with another, but I don't exactly check the status of my quiz lists very often (almost never after the first month, in fact) because I'm not expecting anything to happen. So if something unexpected *did* happen, there would likely be a quiz list that it was impossible to get newly claimed for an indefinite, extended period of time. And, when I finally did find out about it, since I would have no knowledge or control over if and when the quiz that was taken offline could return, to save effort, I might just delete the quiz list.