Ejector marks/Primer cratering even when velocities and pressures are low.....What's your take?

quick video about pressure signs on my AR15 brass even when there's no excess or high pressure. ejector marks and/or slight primer cratering on my brass regardless of how high my velocity and pressure is. I want to get your take on my situation and ways to fix my issues if they are indeed issues to worry about. Lets talk it out in the comments.