# Tag History algorithm bug **URL:** \ **Category:** Ignition\ **Created:** [October 3, 2025, 3:43pm UTC](https://forum.inductiveautomation.com/t/tag-history-algorithm-bug/111175 "2025-10-03T15:43:19Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![lrose](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/lrose/32/62724_2.png) [@lrose](https://forum.inductiveautomation.com/u/lrose)\ **Post date:** [October 3, 2025, 3:55pm UTC](https://forum.inductiveautomation.com/t/tag-history-algorithm-bug/111175/2 "2025-10-03T15:55:19Z")
Looks like you may be running into this issue. > [@Power Chart Interpolation](https://forum.inductiveautomation.com/t/power-chart-interpolation/111041/6): > > This topic came up a lot during training sessions. The main reason I've found that causes this is actually in the tag historical configuration, specifically the deadband style property. There are three options, auto (default), Analog and Discrete. Auto will choose either Analog or Discrete based on the tag type. Basically anything with a floating point is set to analog. An analog deadband style always assumes a linear path. Think of temperature, it's impossible to jump from one temp to anothe… Yes I know the linked thread is primarily about the perspective Power Chart, but if you scroll down you will see that people see the same issue with the Easy Chart. That and the actual issue in that thread was a tag configuration issue. --- _[View the full topic](https://forum.inductiveautomation.com/t/tag-history-algorithm-bug/111175)._