Issues with datas

Quant Trading Strategies & Ideas
1

Hi, I have issues with my strategy and I want to know if someone know why. When I do my strategie with yahoo data or alphavantage data I have very good return. But If I do the same thing with the Metaquotes data I have a very bad return and I don't know why its so different. (Forex strategies).

2
You can check for the below points.

1. Data that you are getting from both sources, Yahoo and Metadata are matching up to some decimals. If there are any adjustments, those are accounted for in both sources.
 
2. You can check for the strategy logic in both tools. For example, the way technical indicators are calculated should be the same in Metadata and any other tool that you are using.