Hi Caseynotes,
I understand you're trying to be helpful but you actually haven't been. A quick search on the forum with the screenshot you provided hasn't delivered a very detailed and non-vague answer.
The Australian stock market has two exchanges - ASX and Chi-X. There is very little volume that gets done on the Chi-X so its predominantly the ASX where most of the volume gets done.
I'm currently looking at a five minute chart of Nearmap (NEA), a highly active mid-cap stock. On IRESS and Tradingview, the first 5 minutes (10:00am to 10:05am) shows the volume as 121,000 shares which is correct. ProRealTime/IG shows a volume at that time of 74 which is just not possible.
Can someone from IG please answer this as this is completely messing up scanner for ASX stocks? Thank you.