The mouse movements on my Hikvision 8P NVR screen are not controllable I have to be so careful to select the correct item. My support engineer has tried but can't figure out what is happening. When I switch back to the Windows screen my separate mouse for windows works perfectly and can be controlled. My NVR screen HDMI feeds into a switch box for PC & NVR to one screen. The NVR has a separate mouse via a dongle plugged into NVR even tried a wired mouse plugged directly into the NVR still same problem. It appears to be I think a Hikvision software build problem. Can anybody help, please?.