I have been working with IBK before and switch now to QuantConnect. The first part of my IBK Algorithm that I switched over to QuantConnect relies heavily on Volume. I had to discover that historical Data for Volume differs between IBK and QuantConnect. Here is one example:

‘AAL’ daily Volume for 11-18-2022:
IBK : 22,422,000
QunatConnect: 25,028,137

To complete my confusion, finance.yahoo gives yet another value: 25,968,300