Good afternoon! I work with wealthlab and have developed a trading strategy for the DJI. I refined it a several times and now it runs very good - on the paper yet. The backtesting results for 8 years are: + 900.000 $, max drawdown 16.000 $ and profitable trades : around 80%. First I did not believe these good results, even because it is a very simple strategy that buys / sells using a limit order and closes the position at the end of day. I looked at the chart that the wealthlab software draws and could not find any technical errors that could have resulted from false programming. Here's my Problem: Before trading with real money, I tried to backtest the strategy manually at tradesignal.com, a german website with a good charting tool (for free). BUT THERE ARE FOR THE SAME SYMBOL - DJI - COMPLETE DIFFERENT DATA SOURCES! For example in wealthlab there was the daily high @ 11000, and in tradesignal.com it was @ 11030. Another day, there was a black hammer instead of a white doji at tradesignal. I looked after the problem but could not find an answer. I did not change the DJI with its future or something like this. I just have two different data sources , it seems. My trading system runs not that good @ tradesignal, of course, because it is a intraday strategy (basing on a limit order to open and an order for the closing price of the day to close). ===>>> Which data can i trust in? Which one is wrong? Could the reason be that tradesignal is a german site with a chart that is convertetd from $ to EUR?? (althougt there is USD written at the left side). What should I do?? The rrading system runs super in wealthlab, but does it because of wrong data?