The case you have circled is simply Kindle obeying the default of justified text, adding a minute bit of space to each space between the words. The easy but unhappy way to remedy this would be to specify left-aligned text. Most people would probably not object. Even I am willing to read ragged right books, though I do so with a feeling of disdain for the formatter.
The problem has been much lessened in recent years with the introduction of Enhanced Typesetting and automagical hyphenation, awful as the results sometimes are.
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