Alpaca volumes question - off from brokerages and yahoo by 25%?

[Homer]

im adding a link to another post someone had a while back of a similar question. for reference only. i still have my questions above.

Accuracy of streaming / real-time volume and vwap

Hi, I have pro subscription and noticed that streaming data of stocks are not accurate. I used Yahoo Finance API and TC2000 to get real-time data of e.g., a stock like MSFT. I noticed that the Volume value of Alpaca is usually less than volume value which I get from Yahoo Finance and TC2000. Therefore, VWAP is also wrong and does not match with VWAP of TC2000. Why it is like this? Do I do something wrong? api.get_latest_bar(“msft”)