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Random Greek Symbols appears in pdf generated by LaTeX

I use Texmaker. Once the .pdf file is generated by LaTeX, I notice that there are several greek symbols (mostly Sigma) in random places. Does any one know the reason? (My code does not contain these ...
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Greek pdf bookmarks

I am puzzled with sections titled with Greek characters. They do appear in the pdf's Content list, though not correctly. For example, in my thesis--written in English with LyX, based on the ...