Display does not show picture in full (video)

[done7k]

Hello!
I used your Benchmark script (actually some other as well with the same result). The display does not show full pictures but only some of dots. If I press reset button it display as normal untill I release the button. I use Arduino (Genuino) UNO.
What can be an issue?

20221019_170317.video-converter.com.1.mp4

[HenkVanHoek]

I have the same issue. When using the serial monitor, the correct picture is shown correctly for a brief moment.

[undercookedPotato]

I have the same issue too.