Calculated Field Counts Off

I have a Calculated field that is set up for a Distinct Count the Perform Calculation on looks like this:

(query.prg_cod EQ "UNDERGRAD " AND query.level_ LTE "2" AND query.soc_sec)

Sometimes it counts the when the prg_cod is not equal to "UNDERGRAD " and sometimes it counts when the level is "3" or "4". It also counts the first record in the group regardless of the values.

I am using the Report Builder.