I don't have a copy of Word to check this out with, but are you talking about a Word file that has edits? Here's an example:
ORIGINAL: I'm going to the library to borrow a book.
EDITED: I'm going to the store to buy a book.
When you place the Word file into InDesign, you get this:
I'm going to the librarystore to borrowbuy a book.
If that's the problem, you open the Word file and find "accept changes" (or something like that). I haven't done it in years, but that's what I think you might mean. If not, someone will be along with a better answer.
Here's how I would do it:
Step 1: In Microsoft Word:
Step 2: In Indesign:
Hope that helps