Hi! I will start saying I am no expert, just a user with the same or a very similar problem, so please be cautious if you decide to listen to me.

In my case, my payroll account was increased in random days only, counting two times the salary of one or two employees, not all of them.

I followed the first answer in here about undoing the match and matching it again, and did not work, but I noticed that only the “duplicates” had an option to match with a “payroll expense”, and not only with paychecks like the others.

So I went to my checking bank account (in quickbooks, (from my balance sheet), and I found extra lines with the duplicate amounts. I compared with my bank statement, to confirm, and yes, they were extra lines that I never input.

So, I changed those lines values to $0 (I guess you can delete them completely if you want), and I got what I was expecting in both, my P&L and my bank account (balance sheet).

I am not expecting any issues in the future after the changes, but will post if I find/observe any problems.

Hope this helps. Have a nice day!