Everytime I screenshot I notice the screen goes super bright

Hello! So, every time I screenshot, I notice the screen goes super bright, I asked someone else with the same iPhone and that doesn’t happen to him, I think my screen doesn’t have the brightest set up, and I have checked everywhere on brightness settings and on brightness settings on the tasks menu, nothing is activated and I have tried everything I just can’t have the maximum brightness on my screen. Help!

[Re-Titled by Moderator]