Not quite understand Payroll Integrity Report - R77020

Our company never ran Payroll Integrity Report before. But we were told it is necessary to run payroll Integrity report by the end of each month.

It seems to us that all other reports are find, no error shown on the report except one - R77020.

The proof mode report shows F06176 doesn't match F0618 table. Error message says "Hours do not match" But we never had issue in EI hours report, and no issue encounter in T4 in terms of EI hours.

I tested in Testing environment, once I ran this report in update mode, all the errors are gone.