CheckTable treats rows that are out-of-order as if they do not exist, and continues looking for the next row in the sequence. This can cause CheckTable to report out-of-order errors for subsequent rows, even if only a single row was out of order.
For example, given the sequence: 1, 2, 4, 6, 8, 20, 9, 10, 11, 12, 17, 18, 21, 25, CheckTable would see 9 as being out of ascending sequence. CheckTable would therefore ignore the 9, then continue looking for a row to follow 20. In this case, although 20 is likely the only row that is out of order, CheckTable would report errors for rows 9 through 18.