I don;t know the specific cause of this, but it has happened 3 or 4 different times over the last few months.
If I have an item in the wish list and it's price changes in some way, sometimes it greys out and shows like I own the product. If I click on the product and go to it's page it shows that I do not own it and has a different price. This is annoying, but not serious. If I delete it from the wish list and then re-add it, then everything is OK and the new price is correct.
This posting is just so you can log the error if you want to.