This is does't work to me. First tag was "Cillout" in my post. And second "music". System places post into "Chillout" category.

When I tried to change "Chillout" to "music" system places "Chillout" at the first place always.

If I try to delete "chillout" from category list, system adds it again. So I don't have ability to change category for the post. Terrible....