A possible reason for payroll record duplication in bank feeds is the wrong account setup as the Payroll Bank Account.

Let's say the accountant setup QBO Payroll initially with bank account xxx123  and over time, this account was no longer the primary business checking account used for paying salaries, and was replaced by bank account xxx456  , be it at the same bank under the same name. 

This will make the payroll DD go to old one and bank feeds show up in the actual current account.

SOLUTION: Go to the gear icon, Payroll Settings and check the bank account, fix it.  More work to adjust the old disconnected register may be required.