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@JonoGee
Did you ever touch the /boot/config.txtfile ? Or only did the config using $ sudo raspi-config or via the GUI ? It can be you selected Overscan there.
/boot/config.txt
$ sudo raspi-config
Overscan
Can you also show the output of this command ?
$ cat /boot/config.txt | grep -v '^#' | egrep 'overscan|framebuffer|hdmi|dtoverlay'