Large volumes but not change in substantial holding, page-4

@hoots Hi Hoots. Can you help me with this one. I am talking about the NZ exchange, not ASX. Whats been happening is that there are orders traded as they should and if you go to the daily graph you can see time these were traded and you see a bar showing the volume. But then randomly the total value traded for the day jumps from $50,000 or so to $4million within mintutes!!!! and if I go on my graph, this ginormous trade is no where to be seen (it would stand out very clearly because the volume bar would be reaching the sky). I know its normal for orders not be shown in the depth but once its been executed it should show in the history right? I am sure there is a reason so I just want to know your thoughts. Your insight will be greatly appreciated.

Since you're here, a chart update will be awesome

Pic of daily graph I am referring to attached.