Discrepancy in Query Analytics Data

I have some doubts regarding QAN dashboard in PMM. There is some discrepancy in data shown.


Here it says query is taking 16.97 seconds, but when I tried running the query, it actually fetches the data within a second or so.

Also in the second Image,


I am not able to understand what does total query time of 278.81ms means, when one query is taking 16.97 seconds.

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