Hello Nrbconsultancy,
Welcome to the Community page,
It is showing as a tax refund. Are you using the correct tax calculation method for the employee? You can check it from the Employee profile>tax information section. If the tax calculation method is set to cumulative method it will assess an employee's total gross pay for the tax year calculate the tax due. If the tax calculation is set to W1/M1 it will calculate the employee's tax based on the total gross pay for the current pay period you are running.