Missing WIP Records from Payroll

We have a couple of jobs where all of the WIP records are not coming through to billing from payroll. It's not the complete job where the data isn't flowing through, but a particular cost code. The cost code flows through for other jobs. I have verified that the send costs to billing is checked, checked all of the payroll and job cost reports and the data is showing up in those modules. The next week hours will flow through to WIP for the same job. I am at a loss as to why the data isn't coming through.....any assistance would be greatly appreciated. Thank you!!