Unreal editor is receiving the down key infinitely

Do you have a joystick or a controller plugged in?

(Excuse my english)

Unreal editor is behaving as if the down key is always held down.

Please look at this:

225357-ue-bugreport.gif

That’s in PIE mode. Though I never touches any key or mouse, the camera is moving back and back. If I hold down the up key, the camera stops retreating.

And this:

225359-ue-bugreport2.gif

Not only PIE mode, but it happens anywhere in the editor.

I clicked on that 空のプロジェクト only once, and then that orange rectangle is going down and down as if the down key keeps to be hold down.

It’s not keyboard or mouse’s fault. I tried to pull out a usb receiver of those devices, completely shut out from the computer, but no effect.
There’s no any irregular things on other programs.

Please help me.

Oh my god…
A game controller was plugged in, and certainly the stick was tilted. I was completely forgotten about it.
Thank you very much!