Power Button Siri

When I try to switch off my iPhone 12 by pressing and holding the power button Siri gets activated. Siri doesn’t work properly though when it is activated like this the voice doesn’t work.

Secondly, when I connect to a device via bluetooth the volume button gets activated too without being pressed. These problems started when a generic (non original) screen on my previous iPhone 11 was installed and it kept saying the screen is not the original.