When downloading logs from the platform you may notice that the column headers shift from time to time. This is due to the fact that the survey data (for both operators and visitors) is dynamic.
If there is no data for a particular survey question in the dataset determined by the site, operator, and date range parameters, that survey question will not be present in the column headers.
Furthermore, if either survey is changed during the timeframe selected you will see additional columns for data from both the old and new surveys.
When running analysis it is recommended that you use an hlookup to ensure you are referencing the correct column headers.