Repainting
Technical analysisAlso called: Repaint, Repainting indicator
When an indicator or chart marker changes its historical values as later data arrives, so what it shows today is not what it showed at the time.
In plain terms
Anything that centres a calculation, or that marks a swing point only once the swing is confirmed, cannot have known the answer when it appears to. A backtest that reads those values as though they were available live produces results you can never reproduce with money.