They tell me it should not take longer then one our, so I provide pretty simple solutions. This from their mail: "The challenge should not take you longer than 1 hour and focusses on your problem-solving skills."

So, I was thinking they tell me is I solve problems or not, at least.

In that case, unless your code was horrifically formatted or just plain bad, I think I'd go with my first answer and say you've dodged a bullet.