You're likely using the wrong variable inside the loop.
Wrong: Using the original list variable inside the loop Right: Use the loop iterator variable
For Each
  Items: record_list
  2-For Each Item: current_record ( Use this variable)
  
  Send Email action:
    To: current_record.email  (NOT record_list.email )

Quick Fix Steps:
Open your For Each loop
Note the name in "2-For Each Item" field (e.g., current_record)
Update ALL actions inside the loop to use current_record instead of your original list variable


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