These indicators may be "cumulative" indicators. A cumulative indicator is one that builds upon itself (using its own previous value). For example, any indicator involving an exponential smoothing fits into this "cumulative" category. When an indicator is cumulative, its value is dependent in some way on all previous data elements that are considered in the calculation. While the chart is loading a certain number of bars (depending on the chart's viewing period), the custom column is loading a minimal number of bars for efficiency reasons. Most would consider the chart to be more reliable because it is typically considering/loading more historical data in its calculations. To make the chart match the custom column, use a custom indicator setup with "Bars: All Data". That will force the custom column to calculate using all the data for the given periodicity that is available (as opposed the minimum efficient number of bars that Inveswtor/RT determines). This method is not as efficient, but more accurate.
