I reset my level from 16 to 0 a while back and averaged a new level a week to ten days since then. I’m currently at level 17 but haven’t burned a single item.
I reset my level once before but burned items along the way well before reaching level 16. I’ve looked through the posts here and haven’t found anything to suggest a reason though I agree with several posters who say they would rather not have items “burned” and permanently removed from their queues. I too would like to see them come up again in further lengthening intervals.
It takes an item roughly 6 months to go from lesson to burned, and you can easily go from level 1 to level 17 in less time than that, so this doesn’t seem that unexpected to me, unless I’m misunderstanding the issue.
EDIT: And burning before level 16 would just involve going slower. If it takes you 6 months to reach level 10, you’ll be burning stuff at level 10. If it takes you 6 months to reach level 5, that’s when you’ll burn stuff, etc.