sticky_posts=”true”

Hi. I can’t get sticky_posts=”true” to work. What am I doing wrong?

This is the shortcode that I am using:

[recent_post_slider sticky_posts=”true” category=”1,2798,2352,2701″ limit=”4″ show_category_name=”true” autoplay_interval=”6000″ show_author=”false” arrows=”true” show_date=”false”]

Sticky posts are still sorted in datetime desc.