I don't know whats worse, the fact that this is an Excel error or the fact its a case PER COLUMN not ROW, what sort of person would set it up like that!
When I first heard that cases were missing I thought “can’t be an Excel problem, the rows run out at 1,048,576 which is bigger than even total cases”.
I never thought they’d have a case per COLUMN. Unbelievable. And yes: Excel columns end at 16,384 aka “XFD”.