In very rare cases, price charts of cTrader can show some false historical data. Such data could be stored in the cache, resulting to show false market price feeds in a historical bar.
It is only a small glitch on the trading platform’s side, and can be simply fixed by refreshing your charts.
To refresh a price chart, right click on the chart and click the refresh field. This will let cTrader clear the cache and re-download the historical data.