[Plugin: FeedWordPress] Excerpt not updating when modified manually

Hi
I’m new to WordPress so forgive me if I’m asking very basic question.

I’m using a theme (like Triton Lite) which shows excerpt of the posts on the front page.

While it looks great, the excerpt does not get updated after I edit the content (e.g. adding my comments at the beginning).
The post itself is properly updated, but whatever I do, the excerpt on the front page never gets updated, it just keeps showing the very original excerpt.

I’ve tried other themes (which shows excerpt) but still the same. I’ve also disable other plug-ins but still no luck.

Am I missing something?

http://ww.wp.xz.cn/extend/plugins/feedwordpress/