When a contest is locked or refunded it will no longer be listed under "active" contests in your account.
If a contest you entered into is no longer showing up under "Your Work" check to see if you can locate it under "locked" or "finished".
When you are logged into your account visit your "Your Work" page, and then select contests. At the left side of the page, you should see a dropdown menu. Change this from "active" to "locked" or "finished" to see other contests.