Your documents won't work as required.

For starters, your 'front' document doesn't even contain a table - just masses of textboxes in three groups. And, although your 'back' document contains a three-column table, it, too, contains textboxes in each cell.

You need to remove all textboxes and manage the content layout within each cell. Also, for a label merge, all you need do is get the layout correct in the first cell, then use 'Update Labels' to propagate the layout to the remaining cells.

Are you using a particular label product supported by Word for this? If so, what is it?

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]