Sometimes (when the original two columns share merged cells) two columns are inserted with the same merged cell pairs. When a cell that is part of a merger originally had a value, the inserted row sports that cell with the same value.
I think the desired behavior for inserting a column in between two columns that share merged cells would be to expand the merged cells to span three columns.
Sometimes (when the original two columns share merged cells) two columns are inserted with the same merged cell pairs. When a cell that is part of a merger originally had a value, the inserted row sports that cell with the same value.
I think the desired behavior for inserting a column in between two columns that share merged cells would be to expand the merged cells to span three columns.