You run RPTIME00 but few employees don't get the data transferred. Then you have to run a forced recalculation and the data is correctly transferred.
These conflicts can be caused by many reasons, for example: personnel number locked during the run. It is not a program error but there are ways to minimize such conflicts.
It is recommended to run time evaluation as a nightly batch run. Otherwise, when RPTIME00 is run at the same time at which data is processed e.g. via TMW, locking problems occur, as both transaction need to lock data to avoid inconsistencies.