Content on your List is available as long as we have the rights for it on Tubi, so if something seems to disappear from your List, it may be because we no longer have it available on Tubi. However, if the movie or show returns to Tubi in the future, it will reappear on your List!
Some devices also have a display limit, so if you have added a lot of content to your List, some of the items you added earlier may have been pushed off the visible List. They're still there, and they'll reappear when you remove later additions from your List.
Alternately, if you remember the title of a movie or show that you want to bring to the front of the List, you can search for the title, remove it from your List, then add it to your List again. It will now appear at the top of your List!