Would you be willing to share your PDF documents with us (Adobe) so that we can diagnose the cause of the problem?
I've sent you a forum private message with the instructions on how to share your documents with us.
Thank you for your help!
Thank you for sharing your PDF document with us!
I can confirm that page contents in your PDF document are not properly rendered due to a defect in Acrobat Reader for iOS version 15.4. Sorry for the inconvenience.
I will let you know once the defect is fixed a future release of Acrobat Reader for iOS.