usually when you use personality by abnormals. the camera is supposed to lower when you sit to match the head height.
although it seems that when you have alex's caves installed that just completely doesnt work and looks like this.
its both in first person and third.
https://github.com/user-attachments/assets/774adb17-a130-4677-84e9-f7f98a6223d4

i would suppose its somewhat with the way alex's caves handles the camera effects, the system for it.