Doesn't pull all latest pins

Just installed this on our blog and noticed that it doesn’t pull all the latest pins. Have a look at the widget at bottom right on http://decor8blog.com/, then compare to the Pinterest board here: https://www.pinterest.com/decor8/plants/. The four latest pins aren’t showing in the widget.

Widget configuration is:

Pinterest Username: decor8
Username Board: plants
Max number of pins to display: 12
Thumbnail Height in pixels: 62
Thumbnail Width in pixels: 62
Display title below pins? No
Show “Follow Me On Pinterest” button? none

https://ww.wp.xz.cn/plugins/pinterest-rss-widget/