Windows 10: Mouse pointer moves when moving the arrow keys?

when I use my arrow keys, the mouse pointer moves with them. Unfortunately I don't know where and how I can disable this.
Can someone explain this to me?

:)

 

Mouse pointer moving on arrow keys pressed

I'm encountering a strange problem on my W10 computer, for a few days my arrow keys have been "driving" my mouse pointer. Pressing the left arrow key will move the pointer a few pixels left, etc.

The first thing that came to my mind was "oh well, I must have enabled Mouse Keys inadvertently". But Mouse Keys use the numpad and even then, it's not enabled. Rebooting doesn't help, but I've noticed it doesn't happen if the current window is ran as another user (Administrator) or if it's the Task Manager, which suggests the event filter that's catching the key press events is only active on my UID.

I've tried killing various processes but I'm running out of ideas. I'm fairly sure it's a dumb issue but it's been driving me nuts.

 

Mouse pointer moving on arrow keys pressed

Tried killing all running processes on my PC till the problem went away and I can now say for sure the culprit was...

Microsoft Paint

(classic Win32 one)

Apparently it's got a feature that allows moving the mouse pointer using arrow keys, and for some reason sometimes it doesn't stop listening when the window loses focus, so Paint was running in the background since I often use it and it was still doing its job of moving the mouse.

 

Moving Mouse Pointer

I would like to move my mouse pointer to the top-center part of my primary display (of 3). Is there something that I can use to do that? There are various software packages that allow moving the mouse pointer to specific coordinates on the screen. But,
what of when those are not known exactly? A logical quick calculation might be (0,
median), where median is the approximate middle pixel (in the case of a width of 1,080 pixels, this would be between the 540th and 541st pixels.