So it seems if you have a large wishlist on steam when you enter a key that is purchased or given, it will not let you remove that item from your wishlist. Since when GG sync even if you remove them manually from the GG side they will get re-added (which is working as intended) to handle this I would hope we can get a set that will remove it and not show it, or hide it. I have a 1600-item wishlist so trimming it down would be nice for tracking but I can not.
Steam knows about the issue and really does not want to do anything about it, no fix is planned and they don't care to be honest. We do not know what number triggers this issue.