Only one dropdown level

Hi,

Very nice and usefull plugin. I’m using the shorcode option for showing only one level (or dropdown) of the product category and works perfectly. But I can’t understand the parameter hplevels=?2″ or how to write it. In the page appears a second level that’s is not usefull and don’t need. What’s is wrong in my shortcode?

that’s my shortcode. 
[hpcdd_show_selector hplevels=“1” taxonomy_id=22]

thank you