There are a bunch of duplicate items showing up in my wishlist. I thought this was an issue of my mouse double clicking or something like that but it is happening on two different computers I've used recently. On both computers I'm using Windows 10 and Firefox browser.
The link here is a screenshot of my wishlist with several items having 2 or 3 listings in it. https://sta.sh/0efkbw4eeio
It's a bug I get a lot as well. What I do is press the "wishlist" button on one duplicated item, which will then do the same for the others, and then refresh the page. Do that until there's no more duplicates and it should be back to normal.
Feel free to add reports to Wishlist adding duplicates