I found this page with the same issue: https://medium.com/@strindevall/how-to-fix-a-misbuilt-third-party-wii-rgb-cable-fd649aecb75f
The colors are swapped around. Red=Green, Green=Blue, Blue=Red.
I think the other TV and the SCART to HDMI adapter are actually showing just composite video and thats why you get a normal color picture.
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