Grafana: Zabbix plugin. Incorrect line display on graph

Hello guys. I have grafana which works whith zabbix plugin. I have a some problem with the display of data on the graph. I created template for few servers.

I can’t understand, why “total memory” display incorrect?
Can be the reason for the interval of updating the items?
rss:10sec total: 1800 sec

any ideas?
I am hope for your help. thx

maybe you have enabled stacking?

you should check the response from Zabbix as well, to know if its an issue with Grafana or your Zabbix query: