Weird RGB like pattern

Hello this is my first time of actually trying to use Linux.
I believe I have a weird bug, I don’t know if it is normal, I suppose it shouldn’t happen.

So right before the login screen I see that on my monitor for 1-2 seconds, it also happens when I reboot and it is displayed for a longer period like about 30 seconds I believe, does anyone know what could be causing that? What else information should I provide to help?

I have not changed anything I have a only just installed Manjaro.