There is a blank value that is appearing in drop downs. Does anyone know the reason why and how to remove it?

Metadata default value is “OPEN”.

Code table has no blank values.

There is a blank value that is appearing in drop downs. Does anyone know the reason why and how to remove it?
Metadata default value is “OPEN”.
Code table has no blank values.
Best answer by qquac
I have been informed that the blank drop down is to allow users to exit out of a status.
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