Tax and EI not appearing on pay stub

Good morning,

When employees are terminated from the regular payroll and moved to a monthly benefits only payroll, the Tax and EI amounts no longer appear on their pay stub (CPP still remains).  The totals are correct on the historical pay register and on their T4 slips, so the only issue appears to be the pay stub itself.  If the employee were to move back to the regular payroll, the lines for Tax and EI reappear.  Do you know what the issue might be?

Thank you.