[Plugin: FeedWordPress] Weird Auto Update / Post Mash conflict?

Brilliant plugin. I was able to build a custom feed, import the posts along with custom meta fields and all. Works like a charm.

Only problem is….when syndicated posts are updated (when the content on the originating site changes – as it should) they are brought to the “top” of the post list again.

Wondering if this is a post-mash issue (plugin conflict) or if this is standard behavior. And if it’s standard behavior, how do I make it stop??

Thanks for your time.