My understanding is not odd and certainly not incorrect (thats the last thing it is). Titles in Britain when being examined in such fine detail have many ambiguities and many historical exceptions exist, and you will often find people making up the rules as they go along (e.g, a divorced Princess of Wales's title, the title of "Princess Consort" etc) which is why there is the possibility that either side of an argument MAY be right. You do have a good point but I think you're relying too much on an isolated case, which, in any case, doesn't explicitly show what you're trying to prove.