I'd be glad to help share information about processing payroll/paycheck in QuickBooks Online (QBO).
If you're creating paychecks based on the timesheet hours, and the number of hours is different on the paychecks/payroll, you must double-check the number of hours or time entered on the timesheet. In addition, you can also open report/s to check for the time entered.
If you're using TSheets and the imported hours are incorrect, you may need to get in touch with TSheets Support to check and investigate this further securely.
On the other hand, to learn more about creating paychecks and setting up time sheets in QBO Payroll, you may check these articles: