I may have found the cause of this, or at least another symptom.
When I go to my Set Orders screen my Enthu is shown as 8. However, when I use a 'Former Match' lineup from the drop down at the top of the screen - my Enthu changes to 9. I'm assuming this is just a display problem (that my Enthu is really 8), but this is definitely a bug.
Friends Do not Let Friends Play 2-3 Zone