UltraVNC

Got your point CPC.
My issue was solved from VPN server supply team adding one more mouse as usbdevice to Windows 10 mouse settings, so this was not related to UltraVNC, but to Windows not recognising mouse as such and doing it's own thing.
Anyways, thanks for help!

I don`t use Server. I use UltraVNC Viewer. So this file is not relevant for me.
I did some research and the suggestion is to "change mouse settings to stay synchronised use -usbdevice tablet option". But in UltraVNC Viewer I cannot do it, or can I? I tried to change PS/2 on registry editor inside ...

Have same issue with HP machine on windows 10, it seems it depends on which point i jump into the window. Also the mouse distance between the local mouse and the mouse in windows changes while i move
the mouse in windows. Tried different VNC providers, all same.