Image switching between orientations, seemingly at random

The image on my page above the “poetry” link (the pencil drawing) is switching between vertical and horizontal orientations, with no cause I can discern. It can happen when the page is in editor mode or display mode (or on the published site), and it doesn’t require me to make any changes or scroll around for it to happen. Ideally, I’d like it to stay vertical. Thanks!

Read-Only Link: Webflow - Dudael