see the odd Graph

[fanchao]

I use zabbix to monitor the octets on the interface via snmp (oid=.1.3.6.1.2.1.2.2.1.10)
but the Graph seems odd . I do konw the Graph should not like this . I use Cacti too, it draw the Graph that seems Normal .
Can some one point out why it's that . Isn't it strange?
Sorry, for my poor English, am i clear ?

[MrKen]

Hi,

In your Item config, do you have Store value = Delta (speed per second)?

MrKen