I did some backtesting a few days ago for a period from 2015/1 to 2020/4, and I got result A.

And now I did exactly the same backtesting, the result is quite different from result A.

Did Quantconnect make some changes to its price data in the database recently? Besides, there have been some inconsistency between Live & backtesting results when Universal Selection is used, is it a known problem?