Just a small question, some items have a faint blue outline, wait are they for?

Are they supposed to show if the item is popular or something? Thanks for your answers in advance.

That outline means they're on your wishlist. c: You might have added them accidentally, cause it's really easy. All items have a little plus in the bottom left corner, and if you click that, it'll add to your wishlist.

Ohh ok, makes sense. Thank you, I knew about the pluses but I just took a long break from subeta so I don't remember what's in my wishlist lol