John Deere L100: blades spin continuously

I bought a used L100. I noticed today that the blades spin continuously, even if I have the attachment engagement handle set to the 3 o'clock position (pointed right). It feels like maybe they spin stronger with attachment engagement handle set to the 12 o'clock position (pointed forward).



Is this normal? Or should the blades be completely stopped when the handle is at 3 o'clock?