Open the book in the Calibre Editor. Look in the code view, the centre pane. You may see coding like this on the words with the bold letters:
<b>exa</b>mple <b>phra</b>se
or
<span class="bold">exa</span>mple <span class="bold">phra</span>se (the actual class could be called anything, just guessing "bold")
If this is the case, just get rid of those tags with search and replace (replace with nothing).
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