Fetching incorrect results while Assigning learners using Person Criteria to an Initiative

Summary:

Fetching incorrect results while using Location is 'X' and Job Name Does not equals to 'Y' in person criteria while trying to assign learners to an initiative.

Content (required):

While was trying to assign learners from particular location 'X' to narrow down my search. 

Within this search I need to be able to filter out those results from the Job name – 'Labourer',

but when I use the Job category "Does Not Equal it to 'Labourer', should not see the person records which contains Job name 'Labourer'. However, in a strange way, could able to fetch the person records who has just job code '