Fix merging of surveys from different dates

survey_tools.py

@@ -159,8 +159,8 @@ def update_survey_output(df, output_dir):
             master = current_profile.copy()
 
         # Add (or update) current survey
-        current_survey_col = df.columns[-1]
+        current_survey_col = current_profile.columns[-1]
-        master[current_survey_col] = current_profile[current_survey_col]
+        master[current_survey_col] = current_profile[current_survey_col].values
 
         # Export updated results
         master.to_csv(csv_name, index=False)