The following may (or may not) help in relation to Hik cameras on a Hik NVR:
I've found any of the "Video" settings (eg. bit rate values, quality, resolution, fixed/ constant bit rate, H264/265 settings etc) will be over ridden by the NVR if you attempt to directly set them on the camera via the web based GUI. It will appear to have worked via the web GUI (i.e. the page displays "Settings Saved"), but if you go to another GUI tab and then return you'll find the values have reverted back to the previous settings. The only way to get them to "stick" is to do it via the NVR (under Record - Parameters .... from memory.) Image settings can be done on either- noting the camera web GUI has many additional settings not accessible on the NVR.
(With a ONVIF camera on a Hik NVR I've found the "Video" settings displayed to be incorrect eg. the wrong resolution might be displayed. Everything with ONVIF needs to be set on the camera's web GUI.)
*That's what I've found with my 7608 NVR.*
PS: I've also come unstuck using the web GUI on my notebook as on some pages there is a "Save" button which is often off the bottom of the screen. Some settings pages auto-save as soon as you change a setting (eg. "Image" settings IIRC); whereas, for example, the "Video" settings page requires you to press a "Save" button at the bottom of the page.