Problem with level of sparsity

[Reshetnikoff]

Hi!
I have a question about the one parameter in your model - k (level of sparsity). The paper and the code's documentation claimed that its parameter is the maximum number of non-zero coefficients in the linear model. But, unfortunately, I get a different result. For some k number, I get a larger (than k) quantity of non-zeros coefficients
Is it some kind of bug or did I misunderstand something?
Thanks!