Rendering issues when using DP port


This may have already been explained.
I have a macbook Air M2 with an external caldigit TS4. I used to connect my LG wide screen via USB C. Recently i changed to the DP port on my dock station, as i wanted to free up one USB C port.
Since then i have had rendering issues. It used to be around 40% or so, and after swtiching to DP port, it went into the Red zone. I switched back to USB C port and I do not have render issues again.
I haven't tried to switched back to DP port.

Is that a known issues ?

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