Hi,
I guess that there was a change in the calendar definition, or assignment of a new calendar.
You can't fix it directly, as there's nothing to fix. If there's such a change, then the data that was there before the change is displayed in a separate column, like in your case.
Just to check, go to a new DM version which has no data at all yet, and create some. I suppose that it will not happen now.
Regards,
Mario
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