The 2 pip difference between what you see on the chart and what you see on the trade window is the "spread". There are different prices for "bid" and "ask" depending if you buy or sell. There is no "fix".
Some brokers have a 2 pip spread, some currencies by the same broker have 9 pip spreads. We pay the spread twice, once on entering the trade, once on exiting the trade. This means a "commission free broker" is charging you $40 on a 2 pip spread for EURUSD.