Mouse is weird in Minecraft?

In minecraft, when I stop moving my mouse to look around, the field of view still slides a little further. The mouse is from Nacon, I don't know more details.

Either your pc is lam,
or
your FPS are lam (Minecraft is laughing at you)
or
Something else is broken

Before that it was still functioning normally, nothing is broken.

You turned on the cinematic camera

In the controls you can see which key you have set for it and press it to deactivate it

Toggle Cinematic Camera was actually only made to shoot films, for example, because it makes the camera movement smoother

Not for PvP or something xD

Or he turned on the cinematic camera

Yes, I activated it by accident somehow.

XD