Hi there, @topknotchbookkeeping.
I'm here to help check why your invoices are not showing on your weekly job cost detail report.
Transactions showing up on the report depends on the item type used when creating invoices. Service and non-inventory items won't show costs when running reports. It's possible that some of the items on your invoices are service and non-inventory items. For now, you have to open those invoices that aren't reflecting on the report and check the items and the item types associated with it.
If the items used are inventory items and it's still not showing on the report, then you need to run your report using the Cash basis of accounting method.
To learn more about running and customizing reports in QuickBooks Desktop (QBDT), you may check this article: Understand reports.
Please feel free to add a comment below if you have any other questions about invoices and reports, I'll be right here to help you. Have a good day!