Unable to copy single value from Grid(Simple header less detail form)

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Active Member

It might be silly question or abnormal behavior for this application .
I have simple application which is not allowing to copy value from Grid .
It has order number column.business unit and item number .
Able to copy only order number from editable grid but unable to copy other two .
Its behaving weird even no event rule written in it .
when i press cntr+C cursor goes to start of the a grid

tool: JDE E1 9.1