Keyboard mapping incorrectly on VNC view

I am running VNC Server on a few Linux box and within X windows of the console my keyboard is working fine but on a W98 while running VNCviewer, my “5 / %” key will act like a backspace. I had tried this on multiple client and server that mean it is related to keyboard mapping function of VNCviewer.
Does anyone have any idea on how to get around this problerm?