Double Posts

Hi

i dont know why i get the post double 2 or three times and sometime it come ok!!

i checked this post
http://www.wprssimporter.com/faqs/im-getting-double-posts-with-the-feed-to-post/

still cant fix or actually know the reason why this is happening!!

i use feed to post and it used to work fine since last week maybe because of wordpress 3.9.2

https://ww.wp.xz.cn/plugins/wp-rss-multi-importer/