Container Content Edit Wierdness

I attempted to move some tasks into a new sequence container. It failed saying element cannot be found in a collection. Now I find that visually the tasks do not appear in the container. But in some ways they are. I can not try to move the tasks to the container, or I get the same "element can not be found". If I execute the container, the tasks outside the container run.

I thought to CUT and PASTE my tasks, but then it says "The package contains one or more event handlers for this task. Deleting the task will also delete the event handlers and the event handler context."