Possible bug detected

Tags: #<Tag:0x00007f064a748a68> #<Tag:0x00007f064a748978>

Whilst looking at the web ui, under the Pollers tab using distributed RC poller, I saw the following metric.

This poller only has 205 devices in the poller group. I confirmed it with SQL statement.
Question, where does it get the Devices Actioned Last Interval value come from?