Xvnc geometry problem

I have my RHEL7 server configured for remote access via VNC.

In /etc/services:

# Local services
vnc1024         5900/tcp                # VNC & XDM

The contents of /etc/xinetd.d/vnc1024 (Yes, I know that it says '800x600' even though I called the service 'vnc1024'. I originally had the geometry set to 1024x768, but I changed it to 800x600 to see if changing it would have any effect. It doesn't seem to have had any effect at all.)

service vnc1024
{
disable = no
socket_type = stream
protocol = tcp
group = tty
wait = no
user = nobody
server = /usr/bin/Xvnc
server_args = -inetd -query localhost -geometry 800x600 -depth 16 -once -fp /usr/share/X11/fonts/misc -securitytypes=none
}

When I connect from a workstation via VNC, Xvnc seems to be started with the correct geometry option:

# ps -fC Xvnc
UID        PID  PPID  C STIME TTY          TIME CMD
nobody    5078  5068  0 11:41 ?        00:00:02 Xvnc -inetd -query localhost -geometry 800x600 -depth 16 -once -fp /usr/shar

But the VNC display created appears to have a size of 1920x1200, which is larger than my monitor's 1920x1080 resolution.

I've searched the forum and Google, but I haven't found a similar issue. Can someone point me in the right direction?