Bug: Syndicated posts get repeated

I auto-syndicate posts from various websites to this place using FeedWordPress: http://takshashila.org.in/2015

The problem is all the posts get repeated with a single time stamp whenever a new post is added to the incoming feed.

Could you please suggest if there is an option to change this behaviour?

https://ww.wp.xz.cn/plugins/feedwordpress/