We allow filers to upload documents to our site. We time stamp the documents when they are uploaded. From time to time we have documents where the stamp does not show.
I have tested the scenario and have managed to reproduce the problem that textStamp is not applying on your provided PDF document. For the sake of correction, I have logged it as PDFNET-42313 in our issue tracking system. We will further look into the details of this problem and will keep you posted on the status of correction. Please be patient and spare us little time.
We are sorry for this inconvenience.