If it's all 'a' characters, it's probably just how 'a' is represented in the font you're using; otherwise, you may be inadvertently pressing a keystroke shortcut combination or autocorrect entry that's been assigned to the α character (which you should be able to find via Insert|Symbol > α > Shortcut Key/Autocorrect.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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