PDF processor document stamping

Hi,

I am developing a process where I merge multiple PDF files into a single document. After merging, I number the pages and stamp them using the PDF processor.

I noticed that the processor successfully stamps most pages, but when it encounters a page with a different size or orientation, the stamp is not applied. Initially, I thought it might be a coordinates issue, so I placed the stamp in the center of each page, but the problem persists.

The page numbering still counts those pages correctly, even though the stamp is not applied. I would like to understand why some pages are stamped successfully while others are not.