We acknowledge the lack of visibility and reasoning on why some of your problems are deleted is frustrating. Maintaining good quality problems in Cody will engage all the players in using Cody to improve their MATLAB programming skills in a fun way. While we are working on building more moderation features and bring visibility into how the content is moderated, Cody Team and few top Cody Players are moderating the content to remove duplicate and trivial problems that are very similar to the existing problems. If any of your problems are not duplicates and are significantly different from existing Cody problems, let us know. We can review them and restore them if they add value to Cody players.