In SharePoint 2013, I have added the Comments column to my Shared Documents library. Several of the documents have version comments that were entered at check in, but the comments are not showing up in the Comments column. It is completely blank, and I can't figure out why.
"Comments" is a comment on the document itself and "Check In Comment" is a comment left as part of the check-out/check-in process (version control). You cannot see the version comments ("Check In Comment") because you are not displaying them; instead, you have errantly chosen to display the document comments.
Modify the view, unchecking "Comments", and instead checking "Check In Comment".