What did you put in a search to get that response? I just put in "what are out of sequence trades" and got this ....
Out of sequence trades are transactions reported at a different time than when they were executed, often affecting trading data and charts. Definition and Characteristics Out of Sequence Trades: These trades occur when a transaction is reported with a timestamp that does not match the actual execution time. This can happen for various reasons, such as delays in reporting or issues with the trading platform. They are flagged in trading systems to indicate that the reported time may not accurately reflect when the trade was executed. 2 Implications: Out of sequence trades can distort market data, including price charts and volume statistics. For instance, if a trade is reported significantly later than its execution, it may create misleading price movements or spikes in volume that do not accurately represent market activity at that time. 1
2 Sources Reporting and Handling Trade Reporting: In trading systems, out of sequence trades are still valid and will appear in the Time & Sales window, but they may be flagged to indicate their status. This helps traders understand that the trade's reported time is not aligned with its execution time. 1 Market Impact: These trades can affect the calculation of high, low, and last sale prices for securities, as they may not be included in the official statistics due to their out-of-sequence nature. 1
Understanding out of sequence trades is crucial for traders and investors as it helps them interpret market data accurately and make informed decisions based on reliable information.
Market Data 
Markets 
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