This is most likely a result of "Define styles based on your formatting" or
"Automatic headings," both on the AutoFormat As You Type tab of Tools |
AutoCorrect Options. See
http://word.mvps.org/FAQs/Formatting/TameAutoFormat.htm

--
Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
Word MVP FAQ site: http://word.mvps.org
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"Geoff C" wrote in message
...
Have a problem with styles in tables. When I update my TOC, some cells in
the
various tables in the document seem to have acquired a style that appears
in
the TOC. This seems to occur almost randomly - sometimes it will be a
group
of 3 or four cells together, sometimes a single cell, sometimes even a
single
word within a cell. I can correct them all, save and exit the document, go
back in and make a single change somewhere unconnected, and then when I
update the TOC, new and different random cells will appear there.

I assume that somehow Word is applying that style automatically because it
thinks it appropriate. Is there a way to suppress this behaviour? Or is
there
another explanation? It drives me to distraction.

Many thanks,
Geoff.