It appears as this is the output PDF file. Kindly send us your source PDF document and the complete code. We will investigate your scenario inn our environment and share our findings with you.
We have created a PDF from scratch, and the background color covers all text characters. Kindly open this PDF and let us know how that goes in your environment: Output.pdf (1.8 KB). Please send a snapshot of the problematic area.
I downloaded your Output.pdf file and when I open it I see exactly the same thing. The last letter “N” in “PURCHASE REQUISITION” is only half covered with the background.
Adding an extra space does the trick as I mentioned above.
Please send us a snapshot of the problematic area, and share all details of the environment, including Operating System (edition & name) and local display settings etc. Your response is awaited.