A family of Microsoft word processing software products for creating web, email, and print documents.
Just to be clear, you are using the desktop version (= the locally installed version) of Word and not Office online? I believe that Word online never prints comments.
In the desktop version, when comments are hidden or truncated, the reason is usually that there are too many comments on the same page so that Word can't display them all. You can try increasing the "Preferred width" in the Advanced Track Changes dialog box.