Autocomplete rule always executes last condition

Summary:

Hi There,

I have created this autocomplete rule and it is always executing last 'If' condition :

1st If condition: If grade is between 1-19 and attribute_date3 is null then error
2nd If condition: If grade is NOT between 1-19 and attribute_date3 is NOT null then error (This is the error always showing even if i enter grade between 1-19 and a date in attribute date3 DFF)

Business Object is Worker Assignment

Long Service Award Date is Attribute_date3

Any idea? Thanks!

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