I assume you are talking about the numbers (6 and 7)? If I look at them in the Content pane I can see that they are artefacted:
That said, how are these numbers come to be? Because when I open it a second time, the numbers become 2 and 1.
That said: exporting it without articles tags everything:
I have no idea why when using Articles it is tagged differently other than something clearly is not added...
But I also can not figured out WHAT is anchored WHERE: the shapes are AI images, it looks like you grouped items?
To test, I have deleted the AI images, otherwise I could not even UNanchor (release). Then I released the remaining anchored group (the angles part) and added those to the Articles panel, and exported and that worked again:
So what it looks like is that the text frames ('2 sides 2 angles') were not added to the Articles pane.
Something has gone wrong here.
I tested this with a new document myself, anchored text in achored text and it worked:
Then I placed an AI file, grouped it with a text frame with an anchor and anchored that again, also works:
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