Unable to close planner task

Hello, we are unable to close a task in MSFT planner.  We have tried the following:

- Changing the progress status from in progress to closed.   The progress status immediately changes back to in progress from closed after closing the task.

- Dragging the task to complete.  It moves back to an active task with an in-progress status. 

I have now noticed no values on the task header can be changed.  

Any ideas?