Except in the case of Table Styles and/or other formatting applied only to the last row of a table, I've never encountered such behaviour. Indeed, if the phenomenon affects a wide range of hardware, that strongly suggests the last row is in fact formatted differently. Try selecting the last two table rows and pressing Ctrl-Spacebar. That will remove any character formatting that is not part of the Style definitions for the text concerned. Beyond that, you might need to check that the paragraph Styles & formats are the same. This can be an issue where tables have been combined from different sources and/or have had content pasted into them in different Styles - even if the content is later updated.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]