I believe the drawdown under Stats is peak to valley DD on closed trades while Chart Drawdown is floating equity on open positions. Although I'd like to clarify this as visually it often doesn't match up.
Look at this chart as an example:http://www.myfxbook.com/members/Hanyul/galaxy-x-real/259628
The Chart Drawdown tab says the highest floating drawdown was on April 20. This contradicts the yellow equity growth line on the growth chart which is ABOVE the red growth line indicating equity was in profit on April 20.