Ordinarily, one would expect to have to put whatever spacing, line breaks, etc. one requires between the mergefields. That said, I'd have expected consecutively-inserted mergefields to look like:
«Name»«Address_1»«Address_2»«City»«State»«Post»
(note the '»«' pairs between the mergefields), not:
«NameAddress_1Address_2CityState»«Post»

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]