I'm going to guess that you have a group selection formula that is limiting the display of records in the detail section. Crosstabs are processed in an earlier phase, so will show all records limited only by the record selection formula, not the group selection formula. If you want help with making them match, please identify the fields you are using for row, column, and summary in the crosstab, and type of summary, and then also show the content of the group selection formula.
-LB