Hello @ClaudiaC1 ,
I'm not seeing any of your recent email campaigns with any recent Social Shares, nor am I seeing any accounts connected to the Social tab either. Neither system would trigger to post something unless explicitly set up and confirmed to do so. I looked on your organization's Facebook page based on the one you link in your emails, and I didn't see any posts that indicated they were something made by us.
Do you have any screencaps of the posts that are getting put on your page?