I can't delete a comment on Instagram.
If you keep getting an error message that a comment can't be deleted, it may be because the comment was already deleted in our system. The comment may still appear because you're viewing an old version of the page. We're aware of this issue and are working on a fix.
Keep in mind that you're only able to delete your own comments or comments that are on your own post. You can't delete another person's comments on a post that isn't yours. Learn more about deleting comments.