Guild Wars 2

The mini tiger that you get from the Spirit of the Tiger collection (under Explorer) is part of the 4th and final collection for Chuka and Champawat. However, it seems that if you get the mini before the collection unlocks it doesn’t count.

See this image for an illustration of the bug

You can see that I have the mini unlocked but it doesn’t count for the collection achievement. I got the mini before even completing Chuka and Champawat I.

Same exact thing happened to me. If you get the mini before the collection is unlocked it won’t count it and you can’t finish the tier IV collection.