For example, I had three collections I wanted to turn in (We'll say collections 1 2 and 3 just for example, but those weren't the exact ones.) I click on the turn in button for collection 1, but it rewards me decor for collection 3. The same happened when I tried again, I clicked to turn in collection 1 but instead it rewarded me decor from collection 2. Then finally when collection 1 was the only collection I had left to turn in, it gave me decor from collection 1. This is a bug, no?

Sorry it's kinda lengthy - Didn't know how else to explain it