Hello Kristin. When you post a comment, you can choose to make it visible to the entire class, to instructors only, or to yourself only (you can also choose to post anonymously to the class)---see image below. Perhaps students have chosen the "self only" option? Are you, as instructor, able to see the comments?
Another possibility, depending how you set up the class, is that
the students might be in different sections. Students only see
comments in their own section, plus comments by the instructor.
Navigate to the "users" tab in the course dashboard to see who's
in what section.

My students are not able to see one anotherʻs comments. Is there a setting that they (or I) need to enable?
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