I know that when in auto the video will fluctuate often for the specific conditions at that instant. However, I have recently noticed that even while I have locked the auto or change over to manual I still see a sweeping readjustment of the film. Though this seems to be slower and more overarching at various moments if the camera is in motion (i.e. compensating still for the conditions at a moment). Is this normal and I have just not noticed it prior or am I missing something that could result in the camera still readjusting? Note that I start in auto, lock auto, then go to manual over the course of the video. Thanks

https://vimeo.com/325902857

Noticed the link was dormant, here is the video/link: