I have a client who has one employee, who when they go enter an expense report, the Advance To Apply field will always auto populate the same $ amount each time. But the rest of the employees have a $0.00 balance when they go to enter. The expense account that is hit is the same for all. Anyone ever had something like this happen?

Someone must have posted a journal or check transaction to the default employee advances account and referenced that employee Look at the employee advances register and see if any transactions are posted there referencing that employee

I am not seeing the employee advances register

Go to the list of account then click on the account name for Employee Advances