What exactly "History Quality" mean?

 
I tried to test my strategy for the past month, but I realized the "History Quality" was very poor (30%).

I counted the candlesticks for the time frame in question and for the past month ONE BY ONE to see if anything was missing.

No candlestick was missing!

So, the question is what does "History Quality" mean exactly? Why the "History Quality" is so poor for me?
 
Did you read the documentation?
Testing Report - Algorithmic Trading, Trading Robots - MetaTrader 5 Help
Testing Report - Algorithmic Trading, Trading Robots - MetaTrader 5 Help
  • www.metatrader5.com
— this value characterizes the quality of price data used for testing. It is determined as a percentage ratio of correct and incorrect one-minute data. Bars with a zero spread or volume equal to 1 with different OHLC values are considered incorrect. History gaps are also considered as incorrect data. Depending on size, the period of testing is...
 
Stanislav Korotky:
Did you read the documentation?
Thank you. Actually I am quite new to EAs which is why I sometimes ask obvious questions. Forgive me...
Reason: