Positive Pay file inserts zeros for check number

SUGGESTED

When we updated to version 2021, the positive file was no longer correct.  Instead of displaying 5 zeroes and our 5 digit check number, it displayed 9 zeros and the first number of the 5 digit check number.  Installed update today, which was supposed to correct it, but positive pay file is still incorrect.  I have been editing the entire file, line by line and entering each check number.  This is tedious and leaves much room for error.  I have had several checks bounce back from the bank in the last month.  How can this be corrected?