During backtest of an EA, the closed lot size could not match opened lot size

 
During backtest of an EA, the closed lot size could not match opened lot size (always smaller than opened ones) for same transaction. See attached pic. Some lot sizes are matched, but some are not. Is it normal? If not, why can this happen? How can I correct it?
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I fount out it is because EA closes only part of a opened position. Please close this topic.

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