Not sure what you mean by "the list overview". Do you mean "All"? If so there could be a profile in a collection other than "Owned", for example "Wish list".

There could even be a profile that's not in any collection other than "All". Technically, that shouldn't be possible, but I have actually seen it happen. Not sure how that happens.

Edit: On reflection I think I was misremembering. It was a long time ago, but what I think happened was that I found a profile in "All" that wasn't visible in any other collection. But, I had hidden one of the standard collections that I wasn't using. It was supposed to be empty, but somehow a profile had snuck in there. That's why I couldn't see it. So, if you don't have any hidden collections, that's probably not what you're looking for.