Well from my point of view... the various episodes we have seen aren't "exactly" the stories that were shown in the world of 1998.
As you pointed out, how the hell Bern could figure in EP1? At the very least the tea parties shouldn't be included.
Or think about EP6. Is the novel that Ange reads the very same thing that we read? Sure there is a Featherinne in that story. But is Ange reading about herself talking to Hachijo Touya and reading her story?
I think I've seen something like that happening somewhere...