Kaotik,
Sorry to hear you’re still running into this problem. I have been collecting a few different edge cases to fix in a follow-up release due out later this evening. Hopefully I’ll be able to catch whatever is causing the problem on your end as well. Could you let me know:
1. Whether the dupe problem you’re seeing is on *all* the feeds you’re syndicating, or whether it’s limited to one or more specific feeds;
2. The URL(s) of one or more of the feeds where you’re encountering the problem (to examine the XML in the feeds and attempt to test fixes on my own servers); and
3. Whether you are using any post status for syndicated posts other than the default (i.e., having posts come in as Pending Review, Drafts, Private, or anything else other than Published immediately), and whether you are using any custom post types or other advanced features that I should know about.
If you want to send me any of this information off-list, you can reach me through https://feedwordpress.radgeek.com/contact/
If you could help me out with (1)-(3), it would help a lot in allowing me to make sure I cover all the possible cases when I do my testing for the follow-up fixes due out later today.
Thanks,
-C