Content added in article tags, doubling content, even without article content
As per comments, I found my error:
I was talking about HTML tags. Sorry for not being precise there. I found my error though, which was incredibly stupid. I had given the content an url alias so as to function as a page, which would of course send along the content. I had then added a view as described above, adding the content once again. Silly me. Sorry for the inconvenience.