Inconsistent global scale in KDE on 1440p monitor

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I’ve just encountered this problem.

I resetted all the KDE configs but the issue was still the same.
Found out that it was this line in /etc/X11/mhwd.d/nvidia.conf that was the cause:
In the Section “Screen” (I have 2 monitors)

Option         "metamodes" "DP-4: nvidia-auto-select +0+0 {ForceCompositionPipeline=On, ForceFullCompositionPipeline=On}, HDMI-0: nvidia-auto-select +2560+0 {rotation=left, ForceCompositionPipeline=On, ForceFullCompositionPipeline=On}"

ForceCompositionPipeline and ForceFullCompositionPipeline are the culprits it seems.
Removing this line and rebooting solved the problem.

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