Graph values not consistent

[Singularity]

Zabbix Version : 4.4.10
When checking latest data :
If I select duration as 2 days, then, I can see the graph reaching to value 0 which is entirely correct.
However if I select duration as 7 days, the graph does not shows itself dipping to 0 value.
Am I missing something with the behavior of the graph ?

[Singularity]

Any luck anyone ?

[Hamardaban]

Data is taken from different sources: 2d-from history, 7d - from trends. Read the documentation and use the forum search.

[Singularity]

My bad. Never came across that in the documentation till now. Thanks Hamardaban.

[Hamardaban]

:-) .