Sometimes it happens that a suggested keyword is not counted in the Content Editor, although it is used in the text. This doesn't always have to be related to a bug.
The first thing to be aware of is how word use is counted. Take a look at this article: Why are words not counted?
Thus, it is possible that a word that is used in the text but is not counted on the left will appear in the list under another combination of words. For example, it may happen that in an article about companies selling software, you can find both the separate mandatory keywords "software" and "company", and the additionally proposed compound term "software company". If the word "software company" is used in the text, this is taken into account only in the compound sentence, and not in the individually suggested keywords.
You can individually manage the list of suggested words. If you want to prevent and eliminate this duplication, simply return to the Brief Settings. Click on Content Optimization, a list of all keywords will appear, which will later be displayed in the Content Editor with suggestions. Here the keyword can be simply removed by unchecking the box.