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Dear Paul,
It seems that you have posted a new thread for this issue on our forum.
I have replied to it and you can check the result and share your updates at your convenience.
Sharepoint Power Automate Formula Not Returning All Values - Microsoft Community
Meanwhile, I suggest you reenter the flow>change the end of the flow URL from true to false to change the flow into the classic mode and run the flow again to see whether the issue goes away from your side.
Your effort and time are greatly appreciated!
Sincerely
Cliff | Microsoft Community Moderator