HELP - Changing resolution does change camera

Hello everyone

I have an issue: on Blender 2.9 when I change the output resolution also the camera does change, does anyone know why? How to fix it?

I had the same scene on Blender 2.8 and it didn’t had this issue.

Here the image from 2 different sizes of rendering on Blender 2.9

I’ve already tryed to re-create the camera and to press “Numpad 0” with no results.
Also in the “View Port” the camera looks always right.