Scaling a Cylinder scales other layers too? So I'm following this tutorial:

https://www.youtube.com/watch?v=CVPcT0dJmoY

And at 43 Minutes in, he's putting a cylinder into the ground. I try to replicate this, but scaling or moving the cylinder also scales and moves the ground layer. I made a video explaining my situation:

https://youtu.be/9P0pyaOD78k

Any help is appreciated, thanks.
You have proportional editing turned on. When both objects are within the influence radius, (the white circle around your mouse) the objects will be affected. Pressing O (the letter O, not zero) toggles this on or off.