

Simply re-saving an older-format document in the newer formats can cause significant layout changes. Significant changes were made with Word 2007 and again with Word 2013.
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Layout engine Word uses since the 2003 & earlier days. There have been some major changes to the document That could explain the problems with textboxes and text wrapping to a different page. The page layout, some changes can occur any time a different printer driver is used (even when the printer is unchanged). Since Word uses information from the active printer driver to determine because new printers are being used or the driver has been updated). At least some of the problems you're describing are likely to be attributable to a change in printer drivers (e.g.
