Sometimes, when hovering an over an item in a special shop and clicking +Wishlist, it adds several copies of the same thing to the wishlist. I first noticed this in Esther's shop, but it's also happened with items from the cash shop and New Year's shop. At first it was only one extra copy every now and then, so I didn't think too much of it, but I think it's getting worse? When I went to organise my wishlist earlier, most of the items I'd just added showed up several times and a few had as many as 5-7 copies.

It looks like it only happens on pages which use that particular shop layout (I'm using Firefox on the legacy site).

I didn't think about the why this is happening, but it's happened to me for a long time. I never knew why some items were being added to my WL multiple times, but it makes sense if it was because I was adding them from specific locations!