What's going on there?

While I was in erg mode doing an exercise suddenly appeared this!
I tested the problem three times consecutively with the same exercise.
What’s kind of bug?
After I logout and login I doing normal riding without problem.

Hi @Andrea_Buono

Welcome to the forum,

That look like a display driver or graphics card that is not up to date or not up to spec.

Are your graphics driver up to date.

Can you give us the computer spec?

Nvidia GTX1650 with the latest March driver version.
The strange things is that I tried to go in the frame page for example and it work correctly, I can see it without problem, coming back to the main screen the problem was there, any time I did the exrcise after 6/7 minutes the problem appeared.
I make also a video but it’s a bit heavy to post.