I usually check DB resources on Monitoring -> Graphs.
I especially check the following item.

--item information----------------------------------------------------------------------------
Name: check nfs free
Type: Zabbix agent
key:  vfs.fs.size[/media/backup,free]
New flexible interval: Interval (in sec) 50 Period 1-7,00:00-24:00
----------------------------------------------------------------------------------------------------

There was difference data between Zoom:1h and Zoom:7d about [avg] last at 9:50am(+GMT 9:00) though I check the same data.
ex)
1h ? 41.5%
7d ? 34.6%

I checked server data,and 1h's one seemed correct,it's the same data to server and other monitoring app.

What's more,there were no differences after 10:00am(+GMT 9:00).
ex)
1h ? 41.5%
7d ? 41.5%

Is it a bug?
I can say it's not happened only one time.
But I expect it happens at around 10:00 am, so I guess it can be caused what time last data is updated.

So I would like to know how Zabbix gets both last data, I mean when and how Zabbix calculates data on both 1h and 7d. Are there any differences?