The reason you are getting the * is from the 'data blend' that Tableau does when you link the like fields, as you put it. This * represents aggregated data being pulled over from your secondary source. To resolve this issue we often can create a calculation or edit a calculation being used and add the ATTR() function to the field where we see the *. However to truly resolve your issue I would direct you to the data blending video, I provided the link below. After watching this video you should have a better understanding of what Tableau is doing with the rows of data which in turn is causing you to see the *. I hope this helps!
Thank you for the response and the video! Can’t wait to get this resolved
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