As was discussed recently on this thread, different data providers will show different readings for TICK. Mine showed almost 1000 but I have had only 2 or 3 readings over 1000 this year so far.
who defines what is accurate? Does the exchange provide TICK historical data to check? If not, there is no "right" unfortunately ... time and sales, and thus price and volume, can be verified by the exchange, but TICK cannot, as far as I know.