Thanks for your help, Martin.
Unfortunately, I did have to delete all the payroll processing from July 1st forward and start from scratch. Just used the payslips I had, processed, compared, and re-printed.
Unprocessing and changing the payroll run sequence numbers, somehow messed up the YTD CPP, EI, and Tax numbers. I’m still out slightly on the Payroll Withholdings Report and T4 Summary, but I can manually adjust these numbers as I post and file the T4s through the CRA website.
Lesson learnt… don’t force the change in the dates to the run #. Check out why before proceeding 🙂