Screen tearing with Game Hat

[DieHardMan]

Hi,

recently I own a Waveshare Game Hat and I noticed screen tearing during fast movements.

Diagonal tearing: https://youtu.be/S461Ai1iVS8)
Colored bars bottom right: https://youtu.be/xNZtJUvPF3A

The same can be seen in games.

I use these settings as specified by the manufacturer:

hdmi_group=2
hdmi_mode=87
hdmi_cvt=640480601000

Can this be fixed with some kind of vsync setting or is there an issue with the screen?

By the way, the same occurs with the readymade images of Retropy and Recalbox from the manufacturer's website.

Regards

Stefan