added more calls to "clenup_data_columns()" to remove double index columns after merges

src/sensospot_parser/csv_parser.py

@@ -223,6 +223,8 @@ def parse_csv_folder(
     # the xml file would hold the Analysis.Datetime value
     data_frame[columns.ANALYSIS_DATETIME] = None
 
+    data_frame = columns._cleanup_data_columns(data_frame)
+
     if quiet:
         return data_frame
     return _sanity_check(data_frame)