1. If you have multiple wishlists put into a certain order, then add a new wishlist and delete it, the ordering of the existing wishlists will be scrambled up.
2. If, while editing a wishlist, you attempt to move multiple items from one wishlist to another within a single editing session, the database may 'forget' some of your items that have been moved over; they will disappear from both the starting and ending wishlists. I have not had an easy time reproducing this bug and what may be causing it, because I don't want to experiment on my own saved wishlist items. :)
Thanks Matthew, we'll try and repo these internally and add them to our backlog!