I recently purchased and installed a red pimoroni inky phat red (invoice 2443372, part no 3742). The first program I ran, Hello My Name is Inigo Montoya, from https://learn.pimoroni.com/tutorial/sandyj/getting-started-with-inky-phat to try it out did not work as expected. Half of the screen has vertical lines and a small irregular section in the corner did not update at all from the original image. Right now it is on a Raspberry Pi Zero W with Raspberry OS and I have tried it on a Pi 3B+ with the same results.
See picture, what is going on?