About last serveral minutes message per minutes statistic

as i have noticed that the last serveral minutes message per minutes statistic are always far lower that the real message rate as following. what is the reason ?

The histogram is generated using the “timestamp” field of the messages in the given search time range.
Sometimes the message timestamps are off by a few seconds, so that it looks like the latest messages are processed “slowly”, although they simply haven’t arrived in Graylog yet.

the last lower five in the above chart should be five minutes instead of five seconds?

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