I use my arrow keys to move instead of WASD. When I'm in a menu, such as the crafting menu or the pause menu, the arrow keys will start to control the cursor. After exiting the menu, the keys continue to do so, making my character look up and down as I walk backwards and forwards. When the window is unfocused or even closed, they keep controlling the cursor.

When I tried to record it, it did something different. Whenever I pressed an arrow key, basically the same thing happened, except this time it just put the cursor in the top left corner. It didn't control the camera this time, either.