Autoblog is creating two or three copies of posts it imports

Wordpress 3.6.1, Autoblog 3.9.9.8

Multisite network, autoblog being used with 4 feeds from the same network. Autoblog is set not to sort into a category and make any that are necessary.

In some cases one of the duplicates is missing a category, but in sets of duplicates this is not the case and each dupe has all categories and meta tags, and no differences as far as I can tell.

There is no issue with the feeds themselves.