I have tried to turn in 16 leaves of all 6 tree types and it gives error of You do not have enough required item(s) Collect 16 of each kind of leaves.
Thanks for reporting, this appears to be a duplicate of https://www.ecocitycraft.com/forum/threads/175508. This has already been registered in the bugtracker as ECCDEV-97 at https://jira.ecocitycraft.com/projects/ECCDEV/issues/ECCDEV-97.
@Gluupor has been kind enough to go over the entire challenges setup for us as he came from AEM and has fixed numerous challenges issues / problems. Please let us know if this help/support ticket is now fixed for you @Lodious
