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I haven't done anything with tags recently, but I have noticed that I have to do other things twice sometimes. The other day I went to delete a book from my WL that I got elsewhere, and had to do each copy (I had two versions on the WL) twice before it worked. This isn't the first time either that it's happened. I just figure when it does that they've been updating. I had to resort my WL again earlier in the week too, which usually happens when they do an update.