I'm testing the Z12 strategy on an FXCM demo account. Some parameters are confusing me. As shown in the log, it displays: EUR/USD MarginCost 36->3.5 However, in log\Assets.csv and History\AssetsFXCM.csv, the MarginCost for EUR/USD is -3.33, which doesn't match the above display. What is the reason for this discrepancy?