I also found some elements of the description to be somewhat misleading, most notably the way in which the definition of parameters is interspersed with examples :

"His mother looks out of a window that is 1.5 meters from the ground:
(float parameters window < h)."

When I first read this, I thought that the height of the window would always be 1.5, and indeed in the first few examples the height of the window is 1.5. I think something along the lines of "His mother looks out of a window that is window meters from the ground: [...]" would be clearer.

"He lets out the ball. The ball rebounds for example to two-thirds:
(float parameter "bounce", 0 < bounce < 1)"

I would apply the same general idea here, namely to remove the example and make the parameter in question more explicit : "He lets out the ball. The ball rebounds at a fraction bounce of its original height: [...]"

4217 guys passed the kata.

Which part of it is misleading?

Unless you can point out specific improvements nobody knows how to change the description to improve it.

Change the description of the Kata. In its current form it is misleading. Bad kata. -1