Daily Periodicity Volumes don't match Intraday
Charts that utilize a periodicity of "Daily" will show a different quantity of Volume when compared to charts that utilize an intraday periodicty like 1 minute or 1 Day*. This is caused by the fact that certain types of trades, such as block trades, spread trades and market trades, are considered by the exchange when reporting the cumulative daily volume for a specific symbol or contract. However, those trades are not represented in the tick or 1-minute intraday data for the symbol. These trades together make up the difference observed between the daily volume and the sum of the intraday volume.