This is due to the Sky Sports UHD channels being broadcast in 10 bit HDR HLG and a number of older and less expensive TV's can't process it.
Some TV's have setting options that allow users to turn off HDR HLG or use 8 bits rather then 10 bits on their panel settings.
The main culprits seem to be Samsung TV's, and forum advice suggests checking that the gamma setting isn't too high, try 2.2
On my older LG Nano TV it improves if I turn off HDMI Ultra HD Deep Colour.
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