Numbers of post (shortcode) doesn’t work

Hi there,

Could not change the numbers of post (shortcode).
Constantly showing 10 posts.

http://mississaugafineartsacademy.com

layout=”half”
image_size=”normal”
type=”group”
post_by=”me”
show_logo=”1″
show_image=”1″
show_like_box=”1″
links_new_tab=”1″
post_number=”3″
post_limit=”3″
cache_unit=”1″
cache_duration=”hours”]

Also, all videos from the Facebook plying in feed at the same time…

Is there a way to fixe it?

Thanks!