Hi again Paula,
I can follow up directly via email with you to look deeper into your warning messages.
To tie off this topic, I will explain the message you are receiving. It appears that your channel is defined to automatically address certain conflict statements that might arise while replicating data. One action is to address certain duplicate rows with our built-in resiliency. The messages appear since this logic was triggered which will convert any duplicate inserts into an update, and provide a warning to the logs.
Again, we can continue to dig deeper into your exact condition via an email exchange.