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.
What ended up working for me is changing my Historical deadband to Off. Only needed to do this for certain tags but that solved this issue. Thanks for replying though, turning off tag history caching is pretty good advice. I had some issue a few years back that I needed to turn that setting off for. Can't remember what they were though.