The wish list system seems to be broken. It seems to add an item to my wish list and a box appears around it. After I go off that page I do not see any update in my friend feed nor is the item added to the wishlist.

I'm actually not seeing any of my own recently-WL'd items on my friend feed. I don't know if that's intentional or not but it makes sense to not include it imo.

As for it not being on my WL, that is working perfectly for me. I added an item with the + just now, and immediately opened my WL and it was on there when it loaded.

Yeah it is really odd. One of my friends added to her wishlist and it showed on my feed just like normal. I just tried to add to my wishlist again and it did not show up again. In either my feed or my wishlist.

EDIT: I tried adding some plushies to my wish list and it worked. Apparently it did not (and still does not) work when I tried to add the "uncharted maps" to my wish list.

There was an issue with specific items not allowing users to wishlist them this way. It has since been resolved. :)