Open them and check the steak knives. I bet they are wrong, mine were. Cutlery and more is taking care of it though.
Mine were twin gourmet, made in Spain. Not gourmet, made in Germany.
When it doesn't get stuck, I love it. When it does get stuck, I hate it.
Overall its a damn good machine for hills and overgrown areas, which is what it is meant for, not mud bogging!