I am also another one who keeps encountering the wishlist blue boarder reappearing after you remove it. The only way that I have successfully gotten it to stay gone is by refreshing the page, but it doesn't come in handy when I am doing massive shopping. I always remove the item from the wishlist as I buy the item, then I get confused if I really did remove it because it pops back up. I hope this weird little glitch gets fixed soon.
The border is not showing up in custom wear shops.