Well, at first I thought that maybe some of the trade validation filters don't work with the strategy tester, but given that the forward trading seems to confirm the backtests you might be right.
I just did a quick comparison between my backtests and the vendor's account for the overlapping period (01/2014 - 09/2014) and at least for AUDUSD and EURUSD the trades mostly match. For GBPUSD the backtest shows almost twice as many trades as the vendor's account while still achieving a similar pip gain, and the NZDUSD backtest is way off the chart in terms of pips, showing 6 full SP compared to 3 full SL on the vendor's account.
I hope I won't have to see the backtest results for 2009 - 2013 replicating on my live account, but unfortunately, there is only one way to find out.