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Welcome to the Community forum, clerk5.
When setting up a payroll deduction for the insurance, is it Taxable insurance or Pre-tax insurance?
To isolate the issue as to why the other payroll deductions are affected, I recommend checking how the insurance is being setup.
You can read through this article to learn more about adding a deduction or contribution in QuickBooks Online: https://quickbooks.intuit.com/learn-support/en-us/insurance-and-medical-benefits/add-or-edit-a-deduc....
I'm always here for you if you have any other follow up questions concerning payroll. Just leave a comment below. Have a great day!