Why is OHLC data different on live charts and market watch?

OHLC (Open, High, Low, Close) data is commonly used to display price movement on charts, but the OHLC data displayed on live charts and market watch can sometimes differ for a few reasons:

Different data sources: Live charts may use real-time market data, while market watch may use delayed data.

Charting tools: The OHLC data may be calculated differently depending on the charting tool being used, resulting in slight variations.

Time intervals: The data may be displayed at different time intervals on the charts and market watch, leading to discrepancies in OHLC data.

All of the live ticks or LTP received from the exchange are combined to create the chart's candles. Although hundreds of deals might potentially take place per second, we will only see LTP of one to three trades every second. These ticks are used to create the OHLC for the chart's candles (one minute, one hour, one day, etc.).

On the other side, the exchange streams daily OHLC immediately on the market depth. It would combine all of the thousands of deals that have taken place on the exchange since it is broadcast straight by the exchange. The market depth OHLC for daily candles is therefore more accurate than what is seen on the chart.

Because this strategy isn't relevant to minute or hourly time periods, we can't utilize this market depth data to create candles instead of compiling ticks. Only the daily OHLC is considered market depth. However, we do import the OHLC data from market depth only for daily candles at the end of the day (using exchange bhav copy, which provides the same data). As a result, if you inspect a daily candle at 3.30 pm and then again at 1 am, you could detect a small variation.

Note: It makes logical to include minute/hourly candles in addition to daily candles. Many errant ticks at the start or end of the market might drastically distort the candles.