I buy and sell with commsec. today I decided to take out the...

I buy and sell with commsec. today I decided to take out the 1.8c sellers and a little bit more by buying a moderate amount of $4000, so whilst the market depth showed 180,000 sellers at 1.8c I put in an order of 225,000 shares, thus you would think the depth would change showing 45,000 shares now in the buyers column for 1.8 and the sellers column now being at 1.9c.

Anyway my entire order went through, I acquired another 225,000 shares yet the course of sales only show 25,000 being bought at 1.8c so where did my shares get bought from, I understand commsec can buy off asx over at chi-x but then why does my order not show up in the course of sales, and why cant we see the true market depth of chi-x?

Hope I make sense