Grafana Zabbix data sync issue

Hello,

First thank you for all of your good work.
I am having synchronization issue between my zabbix and grafana data. Indeed when a metric changes in zabbix, it takes more than 30mn to be update in grafana.
I have for exemple my server status down in Zabbix but Up in grafana and it take more than 30mn to be updated in grafana.
Both are installed on the same server so I don’t think it’s a timezone problem.
Thanks for your help.

Zabbix version: 5.0.1
Grafana version: Grafana v7.0.1 (ef5b586d7d)
Zabbix plugin version: 3.12.2