No, that's not normal. I have a couple of 5442 varifocals and a couple of fixed focals. They all maintain a key frame rate of "1". Have a look at firmware versions for the problematic camera and, if there's a problem check the 5442 firmware thread for an update. If there's no difference try a "factory reset" then reconfigure the video streams, along with any other changes you make. Also be aware that sometimes, especially depending on firmware versions, you need to set everything using Internet Explorer rather than Edge, Chrome, Brave, yada, yada.