I am having an issue that when setting scheduled intervals for calculated items that Zabbix is not always performing all of the items set for calculation at the time specified.

For example: I have 2 items that are set to run every 5 minutes. The entry in Update interval (in sec) is 0 and under Custom intervals I have Scheduling set with an interval of m0-59/5. It is exactly the same for both of these items. Yet under Latest Data, one of the 2 items is sitting at 12:20:00 and the other is at 12:25:00 for their last check. It is currently 12:32.

That's about all of the information that I have for now. I haven't been able to find a workaround as of yet, and setting these items to run on flexible intervals doesn't fix the issue either. The items that they are calculating from run on an interval of 30s and consistently report data at those times.

If there's anything I can do to assist in troubleshooting and providing details for this, please let me know.