In a legal document, it's rare for every paragraph in the document to be numbered. Usually, you change between numbered paragraphs and non-numbered (plain) paragraphs of text. When Word sees you switching between these types of formats, it usually tries to help by restarting your numbered list back at "1" (or the first value of your list, such as "A"). There are a few different ways to make the number follow the last number of your paragraphs. In Word, this is called Continue from Previous List.
While InDesign veterans may assume everyone already knows this, I can assure you I have worked with very sophisticated documents from designers who did not take advantage of this basic feature. A good rule of thumb to keep in mind as you tackle InDesign challenges is this: If it’s repetitious, tedious, or time-consuming, there’s probably a built-in solution right there in the program. You just need to go look for it.
Do not let me lead you into a headache under false pretences: this FAQ is not going to tell you how to fix a document that contains broken numbering. It simply explains how the numbering works: this is valuable information if you work with Word a lot, and by understanding it, you can often work out how to fix a document. However, this FAQ is not going to tell you how. (For a discussion of methods, see: List Restart Methods).
Changing the numbering display affects how pages are indicated in the InDesign document, as in the Pages panel and in the page box at the bottom of a document window. The numbering display also affects how you specify page ranges when printing and exporting the document. However, the numbering display does not change the appearance of page numbers on document pages. numbering in indesign