Select Expert Sorting

I have a formula that get's 're-prioritized' after the report refreshes and doens't display what I'm expecting.  

My Record Selection Formula looks like this:

{aptp_view_time_cards.JobNumber} = {?JobNumber} and
{@EndDateOnly} = {?DateParam} and
{@StartDateOnly} = {?DateParam} and

If {?EmployeeName} = 'ALL' then
{empMain.firstname} like '*'
else {empMain.firstname} = {?EmployeeName}


And I don't get any errors.  However, when I refrsh the report, it displays more results that I anticipated.  Then when I go in and look at the formula it has changed to this:

If {?EmployeeName} = 'ALL' then
{empMain.firstname} like '*'
else {empMain.firstname} = {?EmployeeName} and
{aptp_view_time_cards.JobNumber} = {?JobNumber} and
{@EndDateOnly} = {?DateParam} and
{@StartDateOnly} = {?DateParam}

How do I prevent this from happening?
Labor-Report---with-Parameters-N.rpt