Screen corruption on 1 remote system

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Hi all,

I use TV to connect to a lot of remote systems. On only 1 it appears like this:


Lots of lines like a 1990s game of solitaire. Expanded:



The rest of the screen appears fine - just the TV slider that looks incorrect. This PC happens to be located on the same LAN as my PC if relevant.

I've checked and modified all the video settings I could think of to no avail. Any ideas why it appears messed up like this?