What Could of Caused the Dark Shading

This is my first photo on a Mimaya RB67 Pro S and I can see this dark shading on the left hand side. It is only on the first 3 images. The film was lab developed and printed so I'm wondering whether this is a film, camera, development or printing issue. I'm just restarting with analog after a break since to 2000's but only ever used the 1hr labs in those days so not much experience with these sort of issues. Can anyone help understand what could have caused this? All suggestions gratefully received.

https://preview.redd.it/a05r6wu0kjtf1.jpg?width=2148&format=pjpg&auto=webp&s=f51d4b8752f94fd0d2905f4707c466ed061e1105