According to the documents of Election Commission of Pakistan, Eng. Qamar-ul-Islam was declared clear from NAB on 11th June, 2018. The evidance is attached below. You can access the document from ECP site from the direct link https://drive.google.com/drive/folders/1bjuwahXgtbZWbNelFiXyfuve962M6Pdr
and move to 5th candidate of NA 59.
When PML(N) assigned him the ticket, the very next day, person was arrested. This creates doubts in the minds of the people.