By default, the editor merges cells containing the same data into a larger, single cell to make the Crosstab data easier to read.
To display all of the individual cells in the Crosstab instead of merged cells, hover over the Ad Hoc Properties icon 
and select Unmerge Crosstab Cells.
To merge the Crosstab cells, hover over the Ad Hoc Properties icon and select Merge Crosstab Cells.