Zabbix-Server net.if.in[dropped] not displaying result but get command works

[TrevorFurnell]

We're trying to troubleshoot why there is no graph data being displayed for the net.if.in[dropped].
But when we run the get command on the Zabbix-server we get the result that shows there are regular packets being dropped.
We've tried disable/enable the check, restarted zabbix, but not having any luck getting data to display in the graph.

[cyber]

Is there anything in latest data? Is the item ok (not in "not supported" state)..? Any error messages in UI (red "!" marks in config page etc..)?
Do you keep history for item?