DOCX import very rarely perfect
Even DOCX documents with simply plain text sometimes fail to preserve line breaks, page breaks, all sorts of indenting and even text alignment when I try to convert it to the online Google Docs format! Ive had this issue since I started using Google Docs on April 7, 2013 in my media design class at the high school!
staunchnortheasterner about
Google Docs: Sync, Edit, Share, v1.2017.162