Why the difference between E*Trade and Commsec volume.

Anyone have any idea why there is a volume discrepancy between E*Trade on top ans Commsec below it both are real-time. Have a lot of sales with the CXA code going through on E*Trade which are not showing up on Commsec

	Column 1	Column 2	Column 3	Column 4
0	03:47:30 PM	0.019	500,000	CXA

Thanks in advance
Good luck to all holders of SMA.


SmartTrans Holdings Limited (SMA)
(Trading Status: OPEN)
As at 7/04/2015 3:47:51 PM
Real-Time

	Column 1	Column 2	Column 3	Column 4	Column 5	Column 6	Column 7	Column 8	Column 9	Column 10
0	mce-anchorSet Alert mce-anchorAdd to Watchlist
1	Last Trade	Today's Change	Volume	Trades	Open	Today's High	Prev. Close	Today's Low	Trading Basis
2	0.019	-0.002-9.520%	27642307	157	0.022	0.022	0.021	0.019	Normal

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SMARTTRANS HOLDINGS FPO
Tue 07 Apr 2015 3:50 PM (Sydney time)

	{caption}
1	Share Quote
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5	Bid ($)	Offer ($)	High ($)	Low ($)	Volume	Trades	Value ($)	Open ($)	Previous Close ($)
6	0.018[/B]	0.019	0.022	0.019	23,628,398	126	491,272	0.022	0.021