The tax calculation of Intuit Online Payroll is automatic and depends on the setup of your employees.
Since only random employees have duplicate medicare and extra deduction, I recommend reaching out to our Payroll Team. They have the tools we need to pull up your account and verify your payroll settings.
You have two options in getting in touch with them, either by phone or chat contact. Whichever you prefer, you can open the link below for their directory.