There are two types of sentiment scores in News & Moods. One is a keyword sentiment score, and the other is a news (text) sentiment score.
Please see Q8, Q16, Q28
1) Keyword sentiment score: If you do a keyword search, then the sentiment score on each article means the sentiment calculated only on the keyword, For example, Sydney as a keyword, has a total sentiment score on the top (oval).
And in the following news articles about Sydney, there will be a keyword sentiment score (rectangle) for each news.
2) News (text) sentiment score): If you just read news (without performing any keyword search), the sentiment scores on each piece of news indicate the general sentiment of the article (rectangle).
Total sentiment score of the section is on the top (oval).