So I'm using an EasyChart to display the history of this setpoint tag that stays the same 99% of the time but we need it to update on the trend when it changes. For some reason the trend will often show up like this and I can't seem to pinpoint why. I can temporarily remedy this by changing the tag group or replacing the tag but it always does this again and I'm at a loss for how to remedy this and what's causing it to happen.
This looks like the quirk of tag history caching that I ran into a little while back. I can't remember off hand where the setting is, but turning off tag history caching fixed the problem I was having, and in my case, there was no noticable impact to performance.