Launch autopilot failis to circularize properly under certain staging conditions.

If the TWR of the craft changes after the circ. burn has begun, the operation may fail either through the craft re-entering the atmosphere or producing an otherwise unacceptable Pe. (One that is not equal)

It seems MJ will continue to thrust along the same line as prior to the stage sep, even though a new angle is now required because of changed thrust and mass conditions.