HMDA RELIEF automatically recalculates rate spread when the program is passed the APR, Loan Type (fixed, ARM), Lien Position, Loan Term and Rate Lock Date. So the error would exist when the LOS system you are using is passing something to us other than NA or 0 (both converted to NA) AND one of these data fields is missing (usually the rate lock date). So even if the rate spread was missing, it might be auto corrected.
My recommendation is to contact our support department at support@questsoft.com. Because it is only 300 of 5,000, my guess is that it is related to a certain branch or loan program. If it is your LOS system, we will be happy to contact the software company and alert them to the nature of the issue.