Problem: On the wallhaven.cc details page, the main "Add to Favorites" button (the one with the star icon) incorrectly changes its target collection after the user performs a sequence of add → remove → add actions.
Behavior:
Before the first add: the button points to the user’s default collection (“Favourite”).
After removing and adding again: the button points to a different, non-default collection.
Key Evidence: The collectionId parameter inside the href of the star-shaped main favorite button is dynamically modified after these operations, but the UI provides no indication of this change.
Impact: Users believe they are still adding to their default collection, but the item is actually added to the wrong collection.