Board Thread:The Quarters - Q & A/@comment-1661016-20150210185901/@comment-24150802-20150211062042

If you left the challenge but chose "Keep Tasks" then the tasks will still be in your user account.

You might not be able to see them in your browser if they are all completed To-Dos that are more than three days past completion, because those are archived to improve download speed, but they are still in your account. You can see them if you export your data or if you use Data -> Data Display Tool to view your completed To-Dos.

If you rejoin the challenge, no new tasks are added because you still have the tasks that you kept. The challenge knows that it doesn't need to re-add the tasks because it recognises that the tasks are still there. If it didn't do this, then you'd get a duplicate set of tasks every time you rejoined a challenge.

You can either leave the challenge and keep the tasks and then not get duplicate copies of the tasks when you rejoin the challenge, or leave the challenge and delete the tasks and then get new copies when you rejoin. In this particular case, the latter is probably what you want.

You don't need to delete and re-create the challenge; it's behaving as it's supposed to. If you did delete and re-create it, you WOULD get a new set of tasks when you joined the new challenge (because it would be a new challenge) but then you'd notice exactly the same behaviour when you left the new challenge and re-joined it again later.