If the same registry variable appears in Fatal, Critical and Warning severity levels and is not directly referenced in the condition, then that registry variable should be shown in the other column.
The goal of the severity columns to to provide easy access to manipulate the severity conditions. Registry variable references in things like rule variables do not affect the condition. Removing them from the severity column will make the severity columns more focused on the manipulating the condition.
In cases where non-condition severity level registry variables are unique to a severity levels, then the these variables should remain in the severity column.