I ran into the same issue. I must have bought the Leaf Bow accidentially twice, so now I do not have enough tokens left after reaching gold in all challenges.

I took a break and then started playing again. Just now I noticed that all 5 items of the set are again available in the festival shop.

Since the screenshots in my last post I

• completed some quests
• completed a raid
• upgraded my village from level 2 to level 3
• completed the yule quest where you need to find the cows
• In my local timezone it is now past midnight so a new day has begun.

Maybe this helps figuring out why these items keep reapearing in the festival shop.

I noticed that the yule festival shop allowed me to buy items of the Modraniht Ceremonial set multiple times. I have the headress, bracers and robe twice in my inventory. The shop currently offers me a second cloak and pants, and a third set of bracers. I haven't upgraded/modified neither of these items. I guess something is causing the shop to "forget" that I already bought them.