I've noticed that the landing page displays some content of wiki articles. However, wiki articles are formatted, and the preview is not (see attached file).
Therefore, the preview looks messy to me, because there are no formatting or even line breaks to make the text look better. It's confusing to me.
My suggestion would be to insert formatted text as the preview, if possible (just like the wiki article, or a 'plain text formatting' with line breaks only). Another solution might be inserting a "thumbnail" image of the article's initial contents.