Why is OHLC data different on live charts and marketwatch?

The OHLC data on live charts and marketwatch differ due to technical reasons. Live charts use a limited number of trades received per second to form candles, while marketwatch streams daily OHLC data directly from the exchange, encompassing all trades. Daily candles from marketwatch are more accurate than those shown on live charts. However, marketwatch's OHLC data cannot be used for minute or hourly time frames. At the end of the day, the OHLC data from marketwatch is imported for daily candles, but slight differences may occur if comparing candles at different times. It's also advisable to consider minute or hourly candles to account for potential fluctuations during market opening or closing.