Cacti not polling interfaces anymore

[artimaster]

Hi,

I don't remember very well, but while I was playing with the templates after some days I recognized that interface graphs has stopped populating.
I checked the rrd's last update and everything has stopped some days ago. (rrd's permissions are OK)
If I delete the graph and the associated data source and then recreating the graph, it starts to populate.

I checked the data sources and it seems that there is not template selected. (screenshot attached)
Even If I select the Interface - Traffic template and save the change, nothing happens.
I also checked the poller cache for this specific host, and it's empty. I tried to Rebuild Poller Cache, but still nothing happens.

Enabled debug logging and there is nothing except normal polls and results of other hosts except the affected hosts/graphs.
Its seems like the poller skips these hosts/graphs which use the Interface - Traffic template.

p.s. I'm using spine with 1 minute polling internal and cron interval. Step 60, Heartbeat 120.