Continually retrieving posts from Facebook group

Hello community,

I am trying to create the following scenario:

So far I the facebook Groups integration working well, and retrieving posts , however everytime it runs it retrieves the same last posts, I want to loop the execution and retrieve the next posts ( the ones that haven’t been fetched before)

I tried the repeater but it fetches the same posts over and over. So therefore my question.
Thanks in advance for your help.