Every time I preview it, I get Steve and Chris or Chris and Steve. No duplicates. Are you testing this in a browser or in Thunkable Live on a mobile device?
One thing to try is to add a wait block to your loop:
Wait 0 seconds is still a very slight delay in the code. Sometimes that can be enough to fix loop issues.
Edit: When I view this in Thunkable Live on an iPhone 13 Pro and display the list of values in Player Name in a label, it’s blank:
I don’t know why it’s not able to get the local data source values. This displays 6 in the browser but only 1 on my phone:
Edit #2: Okay, it has to do with the data source being a stored data source. When I change it to an app data source, it works as expected. I’m not sure why the stored version is getting deleted.