Backtest vs. Forward Test Results

 

I've been forward testing an EA from August 08 until now. The results from this six month timeframe are recorded in MetaTrader's Account History.

When I run the strategy tester for the same six month period, I receive a different result. That is to say, the backtest results do not match the forward test for the same timeframe. I understand that the Strategy Tester is only a simulation with 90% modeling quality, but shouldn't the results from the last six months match on forward and backtest?

Reason: