It's as I suggested in post #2 - some of the cells have 'hidden' font formatting applied. You can see them appear/disappear by clicking the ¶ symbol on the Ribbon's home tab. To fix it for all cells (there's more than just the two with data), simply select the whole table then choose Format|Font, then click 'hidden' twice - once to apply the check and the other to remove it.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Thanks so much for this solution and big learning lesson for me! It was quite a mystery to me. Thanks again.