In https://github.com/teelolws/EditModeExpanded/blob/main/Source/libs/EditModeExpanded-1.0/EditModeExpanded-1.0.lua#L939
EditModeExpandedManagerFrame:ClearSelectedSystem()
It should be 'EditModeManagerExpandedFrame', not 'EditModeExpandedManagerFrame'

It seems that this line has no practical use, so no error accur. Just change it when you change other things next commit.

This should sort it. Its supposed to deselect the current frame when I close the option box, although I don't want it de-selecting default frames if I only close the EME option box. It was never calling that callback as I was resetting the OnClick script handler elsewhere.