Thanks for posting your question in the Community, mail6,
Let me get the help that you need in correcting payroll hours in QuickBooks Online.
To get this resolved, you'll need to delete and recreate the paycheck.
To delete paycheck, here's how:
Once done, recreate the paycheck with the correct payroll hours.
That's it! If you have any other questions concerning payroll, please feel free to reach back out. I'm always here to answer it for you.