I have a task showing up on my project but no task showing up in the tasks for that project?
did you, at any time, use a 3rd party mobile app for Todoist and/or any Todoist plugin? If so, please let me know which one.
Also, can you remember what did you do when this happened?
For now, try deleting and re-adding the project (please make sure there are no sub-projects under it).