Thank you for your attention. Answering your questions:
Has anyone committed any actions on the submissions in question (either directors or authors)?
One of the articles were already approved and the other one is still on evaluation.
In which Director's queue do the articles appear in?
One of them appears on "In Review" queue and the other one in the "Presentations"
Do the submissions appear in the author's archive (this page is available as a sub-page from the Author's Active Submissions listing)?
No, the article does not appear in the author's archive. That is the point. The article is still on the OCS, it is related with the author's name, but it does not appear on this article's archive.
And finally, is it just for the one author, or does this behaviour replicate across the board?
For now, it is the only case we know, and I do think that it is just the this author